on this saturday night, americans evacuated. the u.s. abruptly closes its embassy in libya. tonight, details of a dramatic evacuation of americans under heavy military cover and what's behind the move. cease-fire. israel extends a temporary truce in gaza as a staggering number of dead are pulled from the rubble and the world braces for what's next. manhunt, the desperate all-out search and big reward for the carjackers who killed three young children as their mother fights for her life. and, not so sweet home, a downside for a wildly popular vacation home rental site. what happens when the guests

won't leave? from nbc news world headquarters in new york, this is "nbc nightly news" with lester holt. providing cover overhead along with the force of u.s. marines, more than 150 americans were evacuated from libya today after heavy fighting in tripoli forced the abrupt closure of the u.s. embassy there. libya has become increasingly unstable in recent weeks with rival militias engaged in some of the fiercest fighting since the fall of the moammar gadhafi regime. large implications for the u.s. which helped topple gadhafi and the fresh memory of the bloody 2012 attack on the american consulate in benghazi. we begin our coverage with nbc white house correspondent kristen welker. good evening. >> reporter: lester, good evening. the evacuation was necessary to protect the more than 150 members at the u.s. embassy in

tripoli. experts say it's the worst violence since 2011. the u.s. embassy caught in intense rival between militias prompting americans to be evacuated. u.s. secretary of state john kerry in paris on a diplomatic mission. >> because of the free wheeling violence taking place in tripoli represents our personnel leaving. >> reporter: 80 heavily armed u.s. marine guards cross into tunisia about 100 miles away. they left the embassy compound in suvs and buses. nbc's jim miklaszewski reports f-16 fighter jets and unmanned drones flew overhead shadowing the group. dozens of u.s. marines, a rapid response force were in the air to respond to any threat. once safely in tunisia, the americans boarded commercial

airliners at a civilian airport. >> we had over 80 marines there on the ground to defend this particular facility. and of course you could contrast it with the situation in benghazi, there we didn't really have protection for the consulate. >> reporter: there was a lack of security and operational failures at the u.s. consulate in benghazi in 2012 when an attack there claimed the life of ambassador christopher stevens and three other americans. the questions surrounding what triggered the attack became a political crisis for the obama administration forcing then-secretary of state hillary clinton to play defense. >> what difference at this point does it make? >> reporter: since then security has been stepped up in high-risk areas, but the violence racking libya now underscores how unstable the region is in the wake of the revolution that led to the ouster of its long-time leader in 2011. >> since the fall of moammar gadhafi, libya has really been dominated not by a central government but by competing

militias. and those militias are looking to gain power. >> reporter: officials stress they are not closing the embassy but rather suspending operations and say personnel will return when it's safe. work is being conducted from elsewhere in the region and here in washington. lester. >> kristen, thank you. israel tonight says it is extending a temporary cease-fire for another 24 hours in its war against palestinian militants in gaza. as an earlier 12-hour pause in the fighting revealed more death and destruction from 18 days of conflict. officials in gaza say over 1,000 people, mainly civilians, have been killed while 45 have been killed on the israeli side, most of them soldiers. we get the latest on the war tonight from nbc's ayman mohyeldin in gaza. >> reporter: it lasted for 12 hours, but the short-term truce gave both israel and gaza reprieve from weeks of war. a war israel says is a must to destroy palestinian rockets and

hamas tunnels used to attack its citizens. for many, like mohamed habib, this short-term cease-fire was a chance to return to his neighborhood where his home once was, nothing but rubble now. and buried beneath it, three of his sons. neighbors pulled out their bodies. it was too much for mohamed to watch. toys, clothes and blankets, the only evidence these were once people's homes. at the hospital morgue we found this man looking for his son. this 23-year-old last seen in this video wearing a green shirt looking for any trapped relatives during last week's cease-fire. foreign activists accompanying salom say at that moment israeli snipers shot and killed him. the israeli military denies it

saying there's, "no evidence that supports this video's authenticity." but the video went viral. his family saw it. and that's how they learned of the death. at the morgue, even after a week of decomposing in the sun, calil quickly recognized his son's body and that green shirt. so he took salon's body and drove by the family home, long enough for his mother and sister to see him from a distance, but not to hold. in an open lot now used as a cemetery, people were frantically digging fresh graves to bury the stream of bodies brought here. where salom's father packed his son's grave with his bare hands. >> couldn't even say good-bye. >> reporter: so many bodies,

their graves only identified by cinder blocks and handwritten names on cardboard. and among them, salom, the young man who went back to save lives and ultimately lost his own. lester, this evening hamas has rejected the cease-fire. in fact, a short while ago they fired rockets into israel. the question on the minds of palestinians in gaza, how long will israel restrain itself before it decides to fire back. and that has people here fearing for the worst. lester. >> ayman mohyeldin tonight for us in gaza. thank you. so with the situation unraveling in libya tonight and still no permanent cease-fire in the latest gaza-israel conflict, the list of foreign policy headaches facing the obama white house continues to mount. let's turn to our chief foreign affairs correspondent andrea mitchell. andrea, how is the obama administration juggling all these crises? >> reporter: it is a real crisis for this white house and for the state department. this emergency in libya, lester,

is just the latest example of what happens when a dictator is toppled when militias vying for power in a videocassette qume. in syria much overlooked here late, 1700 people died only last week. and two years after the president first said assad must go, assad is stronger than ever. the most critical problem right now is of course israel and gaza. and clearly the president and john kerry are increasingly inpatient with israel's tactics given the disproportionate human toll. of course israel is america's ally, but the relationship is becoming frayed. and finally, what could end up being the biggest problem of all, vladimir putin and russia's artillery shelling across the border into ukraine the past few days. the pentagon and cia are working on a plan to help the kiev government target rebel surface-to-air missiles like the one suspected of bringing down a malaysia airliner, but the white house has not yet agreed toyota. lester. >> that's a very full plate. andrea mitchell, thank you.

israeli prime minister benjamin netanyahu will be interviewed tomorrow. and dangerous and destructive weather over the next 24 hours, 100 million people are in the path of these severe storms. weather channel meteorologist kim cunningham is tracking it for us. kim. >> lester, we're watching this line develop now. we think over the next 36 hours a lot of you will have the potential for hail and damaging winds. we're watching this bow echo move off to the east. already some warnings into parts of illinois. we think that will spread east as the night goes on. if you live in indianapolis, it could get to you probably by 9:00 tonight, heading south now into parts of kentucky into southern ohio. it should weaken as it gets this far east. forecast for tonight severe storms, large hail, damaging winds, even heavy rain with some of these storms. now, tomorrow we watch another strong disturbance moving east. and as it does interacts with this cold front going to see more storms and a lot of

moisture moving northward develop. and this is going to mean severe weather not just for cincinnati but now we're getting to the east coast, including d.c., new york city and into boston. that continues on monday as well. so please be vigilant the next couple of days. back to you. >> kim cunningham, thank you. here was the scene in the phoenix area late yesterday as a massive dust storm covered the area. it caused a temporary halt of incoming flights at the phoenix airport, knocked out power to thousands of people and reduced visibility in spots to zero. a big manhunt is underway tonight in philadelphia for two carjackers who stole a woman's car then crashed into a crowd on a street corner. they killed three children. tonight, their mother is fighting for her life. we get more on this from nbc's kristen dalgrin. >> reporter: in philadelphia tonight, a memorial to the young lives lost. >> that's my son you've taken away from me. turn yourself in. >> when you see a little boy that's 7 or 8, i can't -- i can't even begin to describe

what i saw. >> reporter: those little boys, 7-year-old terrance moore and his brother and sister all killed when two carjackers lost control of a stolen suv and plowed through a crowded street corner friday. their 34-year-old mother is now in critical condition, clinging to life in a philadelphia hospital. >> the children, they were like her pride and joy. you know, wherever she went, you know, the kids were there with her. >> reporter: the family was together selling fruit for their church, a fundraiser to help build a new playground. >> just one of the most saddest cases that i've come across. >> how can you live with the idea of you just hitting somebody and running? >> reporter: as anger grows, the manhunt increases. and police comb the neighborhoods near the crash site. >> the two suspects are described as one black male and one hispanic male, both in their 20s. >> reporter: the two fled on foot.

and police say at least one is armed. they're reviewing surveillance video and offering $110,000 reward for information leading to an arrest. >> all i can say is if you know the persons that did this, you have to be able to look yourself in the mirror and say do the right thing and turn these folks in. >> reporter: a search for suspects and answers as a community comes to grips with unspeakable tragedy. chris tin dalgrin, nbc news. we've been hearing a great deal in recent weeks about the immigration crisis in this country from the wave of children entering this country from central america to the political struggle in washington. tonight, we take you to south texas where nbc's mark potter spent time this week with those on the front lines of a border war. >> reporter: along the rio grande in the country's hottest zone for smuggling people to the u.s. from mexico, there is no one closer to the action and as many dangers than the game wardens from texas parks and wildlife who patrol the rivers

stretches in small boats. late in the afternoon when we're along, a three-man scout team confronts a 16-year-old mexican boy. caught swimming from the u.s. river bank toward the other side. the wardens say they've seen him before. and suspect he's a coyote involved in migrant smuggling. with his family screaming at the agents from the mexican side, the boy denies being a smuggler and says he was only out for a swim wearing jeans and shoes. the game wardens call in the border patrol and hand him over to an agent who takes him away for processing. actually catching a smuggler is a rare event given how fast they can cross the river or easily hide in the underbrush. >> anybody can hide in there. you can hide an airplane right there and not even know it's there. it's just that thick. >> reporter: the game wardens ride the river day and night, and when it gets slow they have to change tactics. right now we're hiding in a quiet spot along the river near this downed tree just waiting,

waiting for people on that side to start crossing into the united states. >> reporter: many times though there is lots of activity as when the scout team returned to where they picked up the 16-year-old. and had rocks thrown at them from the mexican river bank. many smugglers are very aggressive. how hard will they fight to protect their loads? >> to death. that's why it's so dangerous. >> reporter: keeping an eye, taking the risks on america's front line. mark potter, nbc news, mission, texas. >> when "nbc nightly news" continues this saturday, renting out your home online to travelers. what happens if the guests refuse to move out? what happens if the guests refuse to move out? and lyou make a great team. it's been that way since the day you met. but your erectile dysfunction - it could be a question of blood flow. cialis tadalafil for daily use helps you be ready anytime the moment's right.

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revolutionized the idea of home away from home. air b & b is enjoying explosive growth matching travelers looking for a room. there's pain in all this as we hear from joe fryer. >> reporter: for $60 a night you can rent a room in linda's portland house. >> here's the room. >> reporter: she uses the website air b & b which connects travelers with those looking to make money by renting out rooms or homes. >> i mean, there's not been one bad experience. >> reporter: air b & b screens the hosts and guests, but on occasion there's problems. the company reimbursed a washington man after renters trashed his house. and in palm springs, california, this landlord rented her condo to a man for 44 days and now says he's squatting. she shared her story with a journalist from business insider. >> every time she contacted me she was extremely frustrated. she couldn't get him out. and all of her real estate friends had said, hey, listen,

you need to lawyer up. >> reporter: because the rental was longer than 30 days, he's now considered a tenant and must be evicted, which takes time and money. air bnb says it paid for the full cost of the reservation and is offering legal support. the company says more than 17 million guests have had a safe positive experience. and as the business grows in popularity, cities are trying to figure out how to regulate it. the biggest battleground is new york city which has an illegal hotel law. it bans people from subletting entire apartments for less than 30 days. and the attorney general plans to enforce it. >> you can't find that any other way as a traveler. >> reporter: in response airbnb has launched an ad campaign as supporters push to change new york's law. >> the incredible benefit to the community and i think regulators need to recognize that and find ways to make it work rather than trying to put it into the box of what would work for a hotel. >> reporter: portland worked out a deal with airbnb and will pass

rules that tax the short-term rentals. >> the share economy is changing and we have to keep up with it. >> reporter: that's fine with linda fitzgerald whose room is booked nearly seven nights a week. joe fryer, nbc news, los angeles. when we come back, why thousands of employees of a supermarket chain are protesting thousands of employees of a supermarket chain are protesting leaving dozens of grocery sto veggies you're cool... reworking the menu. mayo, corn dogs...you are so out of here! ahh... the complete balanced nutrition of great tasting ensure. 24 vitamins and minerals. 9 grams of protein... with 30% less sugars than before. ensure, your #1 dr. recommended brand now introduces ensure active. muscle health. clear protein drink and high protein. targeted nutrition to feed your active life. ensure. take life in. thank ythank you for defendiyour sacrifice. and thank you for your bravery. thank you colonel. thank you daddy.

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american ceo taking home 331 times the average american worker, the scene that unfolded friday near boston may surprise. thousands of grocery store employees risking their livelihoods protesting for the return of their popular wealthy former boss, a regular guy, they describe, who attended their weddings, knew their kids' names, looked out for them. >> it's family. it's family. >> reporter: but arthur t.demus, 25,000 employees strong, was fired last month in a board room battle with his cousin. >> you don't have to air your dirty laundry if you don't want to. >> reporter: intrigue and drama usually kept behind doors says this expert. >> in this food fight they're both dirty. it's been an issue of fraud on one side and then the lack of interest in the business on the other one. neither one of these two guys is a saint. >> reporter: the long simmering family feud is decades old pitting artyt. as he's known

against his cousin. this latest dust-up triggered when one of the remaining seven shareholders, all family members, switched allegiances a year ago. after 41 years with the company, tom trainer says he was fired for supporting a week long uprising that's left stores empty and a $4 billion company teetering. >> on the board shift i sat my family down and said, look, i'm all in. i lose my job, i lose my but that man has done so much for us, i'm going to give back. >> reporter: build share by offering market prices many competitors could not or would not meet and also built strong relationships. these aren't just employees, there's some customers here as well. a bottom line in crisis, a family in turmoil. ron mott, nbc news, massachusetts. up next here tonight, one boy's new outlook on life thanks to the students who found a way to make a difference.

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take them on the way you always have. live healthy and take one a day men's 50+. a complete multivitamin with 7 antioxidants to support cell health. age? who cares. finally tonight, going out and getting a bionic arm is not the easiest thing in the world, especially if money is an issue. this was the challenge for a family in florida who wanted to help their young son but couldn't find a way until a group of college students got involved. nbc's kerry sanders tonight on how they made a difference. >> this one is a cool one. >> reporter: 6-year-old alex prig was born this way. his parents say he's always

coped, and surprised them with what he could do. >> that's the stop. this is the go. >> reporter: but if he could get a prosthetic right arm with a hand, they figured he could do so much more. >> 6:30 -- >> reporter: insurance wouldn't cover his birth defect, so alex's parents tried to build him a new arm with a kit they found on the internet. >> i was thinking he was just going to put it up something like that. >> right. >> he was just going to have a tiny hand on a tiny arm. >> reporter: frustrated with what looked like a toy, his mother wrote a desperate e-mail. need a brilliant mind. and she found just that with some engineering students at the university of central florida. >> and it has a little arm. >> reporter: together using their newly learned skills and a 3d printer. in just six weeks they had something just for alex. priceless. for a dad and son now playing ball together. >> i'm happy. i'm so happy. >> reporter: you didn't think you'd get a chance to play ball with your son like this?

>> not like this. >> reporter: and for a mother. >> i love you. >> reporter: what she never had until now. >> i mean, i cried this first time he gave me a hug because that's something you never think would happen. >> our whole team has been so impacted just seeing the emotion and being able to actually help someone with engineering as opposed to working with like cold machines. >> reporter: at $350 to make this arm, this could be a million-dollar business for these students. instead, they're taking the plans and putting them on the internet for everyone. and for the engineering students, an early lesson how their ideas can have impact. >> thanks. >> thank you. >> reporter: alex is thrilled, but remember at 6 years old there are some things that are even more important. >> are you happy? >> yep. so happy i can get some ice cream. [ laughter ] >> reporter: and alex with his new arm did just that. kerry sanders, nbc news, orlando. that's "nbc nightly news" for this saturday. i'm lester holt reporting from new york. i'll see you tomorrow morning on

"tay" and right back here tomorrow evening. good night.

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