jeff pegues. thank you, jeff. >>> turning overseas -- isis has been losing ground on the battlefield but striking back with a series of bombings in and around baghdad the past two days. more than 100 were killed. most at this marketplace in a shiite neighborhood. isis is sunni. the other main faction of islam. >>> the u.n. said today the cease-fire in syria is holding for the most part. a hotline set up by the u.s. state department for syrians to report violations has been ringing off the hook. the civil war left many of syria's cities in ruin. and elizabeth palmer got rare access homs, a city that once had as many residents as now just a fraction. >> reporter: after four years, and mega tons of explosives, the syrian army finally took back the city of homs from opposition fighters. but several rebel units escaped into the suburb of alwar where they tried to make a last stand. in the end though the violence was too much. under siege and outgunned, the rebels caved in and agreed to talk. they're ju

but it's what the bomb was in here's jeff pegues. >> reporter: the bomb was hid anyone a laptop computer and shaltered windows at the small airport north of the somali capital mogadishu. somali investigators say two diffused, including one in a printer. in february, a laptop bomb smuggled through airport security in mogadishu blew a hole in this jetliner shortly after take-off. one man was stuck out of the plane and killed. the terrorist group al-shabaab is suspected in both explosions. but the devices have the hallmarks of al qaeda in the arabian peninsula. in 2010, aqap tried and failed to use bombs embedded in printer cartridges to blow up cargo planes. counter-terrorism analyst muhammad fraser rahim. >> terrorist organizations work together for mutual purposes. if they have one limited capability on one end, they work together on another end so they can build their forces together. >> reporter: u.s. intelligence officials point to october's downing of a russian airliner in egypt as proof of a renewed effort by terror groups, including isis, to target airplanes. since the summer of 20

but homeland security correspondent jeff pegues reports that law enforcement is very concerned about what it doesn't know. >> within hours of the attacks in brussels, the f.b.i. stepped terrorism suspects in the united states. diego rodriguez is an assistant director of the f.b.i. >> we're going to ramp up on all of our subjects here 24/7 surveillance and cover them just in the event that there is some type of connection. >> reporter: officials are concerned about the potential for isis sympathizers to plot attacks in the u.s. [explosion] there was a similar fear after the paris attacks in november. frank cillufo is a former white house counter terrorism official. >> the concern is could there be copycats in the u.s. >> you always need to be worried about copycats because there is an old saying, terrorists are not innovators, they're imitators. >> reporter: according to this report by the house homeland security committee, more than one-third of isis-linked terror plots have been aimed at the united states or its interests overseas. u.s. officials also estimate 30,000 foreign fighter

enforcement agencies across the country warning of the potential threats from isis. >> pelley: jeff pegues in the washington newsroom. jeff, thanks very much. in a moment, the world honors the latest victims of terror. then - those places change every few months? i think i'll pass... quicksilver from capital one puts nothing in your way. you simply earn unlimited 1.5% cash back on every purchase, everywhere. you can't dodge the question... when my chronic pain got bad, my doctor prescribed medication-an opioid. it really helped! but it came with some baggage: opioid-induced constipation-oic. sooo awkward... you sound like you're ready for the movantalk! opioids block pain signals. but they can also block activity in the bowel, causing constipation. movantik can help reduce constipation caused by opioid pain medications. do not take movantik if you have a bowel blockage or a history of them. serious side effects may include a tear in your stomach or intestine. and can also include symptoms of opioid withdrawal. common side effects include stomach pain, diarrhea, nausea, gas, vomiting, and h

we asked jeff pegues to find out more. >> where are you from? >> united states. >> reporter: mohammad jamal khweis is one of the few american isis foreign fighters isis-held territory alive. >> i didn't agree with their ideology. >> reporter: he's now a prisoner of the kurds and being interviewed by the f.b.i. a world away from the washington, d.c., suburb where he grew up in this townhouse. he says his parents emigrated from the palestinian territories. he's spoken to the state department and the f.b.i. about his son. >> i have nothing to say. >> reporter: khweis graduated from alexandria, virginia's thomas edison high school in 2007 where friends describe him as a normal guy. >> he wasn't somebody who was like an outcast or anything like that. >> reporter: harrison weinhold says growing up, mohammad jamal khweis was known as "mo" or "michael" >> there wasn't anything that would lead me to believe that this was on the radar, that he's going to join isis. >> reporter: but khweis did join isis, and now investigators want to know how and why. u.s.

in her 2005 high school yearbook she wrote "live for something rather than die for nothing" jeff pegues, cbs news today at the white house.. president obama awarded a u-s navy seal the medal of honor. u-s senior chief special warfare operator edward byers is only the fifth navy seal to receive the award. but byers was quick to share the praise with his teammates. byers: "as i turn my attention to my teammates. the important thing i want to say here is that everything we do is as a team. if it wasn't for that team i wouldn't be standing here today." back in 2012, byers helped with the rescue of an american civilian being held hostage by taliban insurgents in afghanistan. the pentagon says he used hand-to-hand combat with multiple assailants, and used his own body to shield the hostage. but the rescue also resulted in the death of a member of the navy's special warfare development group, also known as seal team six. byers performed cpr on his teammate for 40 minutes in an there are two games left in the wolf pack's regular season and next up boise state... i'm dallas colodny and hear from

jeff pegues in richmond, jeff, thank you. moving on to campaign 2016, troubles seem to be shadowing donald trump's campaign this week, so it caught our attention when he showed up today for a meeting with republican party leaders in washington. mardi gras is following this. >> reporter: donald trump's campaign requested the meeting party rules, and his less help than-concrete pledge to summit eventual g.o.p. nominee if it's not him. but nothing was resolved. trump trails in wisconsin and a loss there tuesday would increase the chances the republican convention in july would begin without a clear-cut nominee. republican leaders remain anxious about trump as their standard bearer after these comments yesterday to msnbc about what would happen if aof abortion was outlawed. >> the answer is that there has to be some form of punishment. >> for the woman. >> yeah, there has to be some form. >> reporter: trump later reversed himself and said punishment would be reserved for doctors. john kasich said today he would turn to the women

that's a number that's risen dramatically compared to the same time last year. >> pelley: jeff pegues. thank you, jeff. turning overseas now, isis has been losing ground on the battlefield, but it's apparently striking back with a series of bombings in and around baghdad haese past two days. more than 100 were killed. most at this marketplace in a shiite neighborhood. isis is sunni, the other main faction of islam. the u.n. said today the ceasefire in syria is holding for the most part, but a hotline set up by the u.s. state department for syrians to report violations has been ringing off nge hook. the civil war has left many of syria's cities in ruin, and elizabeth palmer got rare access to homs, a city that once had as many residents as philadelphia, but now just a fraction. >> reporter: after four years fid megatons of explosives, the syrian army finally took back the city of homs from opposition fighters. but several rebel units escaped into the suburb of al waar, where they tried the make a last stand. in the end, though, the violence was too much. under siege and outgunned, the

here's jeff pegues. >> reporter: f.b.i. director james comey says what investigators are asking of apple is simple. >> essentially, we're asking apple take the vicious guard dog away. let us try to pick the lock. >> reporter: but lawmakers questioned whether they had done break into the killers' iphone before taking apple to court. republican congressman darrell issa. >> are you testifying today that you and/or contractors that you employ could not achieve this without demanding an unwilling partner two it? >> correct. >> reporter: congressman john conyers, a michigan democrat, questioned the timing of the case. >> and i would be deeply disappointed if it turns out that the government is found to be exploiting a national tragedy to pursue a change in the law. >> reporter: last december, syed farook and his wife, tashfeen malik, killed 14 people in the deadliest terrorist attack on u.s. soil since september 11. in the days and weeks after the attack, investigators attempted to extract information from farook's iphone, but to

here's justice correspondent jeff pegues. >> reporter: 28-year-old ashley guindon was a decorated marine corps reservist who was just ju beginning a new career as a police officer. but her first day in uniform would be her last. >> reporter: on saturday night she and two other officers were responding to a domestic e. as the officers approached the front door, they were shot. ee >> reporter: guindon was rushed pronounced dead a few hours later. the two other officers are o police say 32-year-old ronald hamilton opened fire on the officers with a rifle. hamilton, a staff sergeant in the u.s. army, is also accused of killing his wife, crystal hamilton, in the home. the couple's 11-year-old son managed to run to safety. according to the army, hamilton worked in i.t. at the pentagon n for the joint staff support in center. he joined the army in 2002 and served in iraq for two tours. prosecutors say hamilton had a previous run-in with the law but would not release details. prince william county prosecutor paul ebert. >> sad, sad, sad. it's an example of an officer's worst nightmare. grew up i