good night. captioning sponsored by cbs >> brown: as the president lands in europe, his u.n. ambassador delivers a warning to north korea. >> one of our capabilities lies with our considerable military force. we will use them if we must. >> brown: also tonight, a deadly holiday weekend. >> it is clear this was an unprovoked attack. >> brown: a new york cop is gunned down in what police call an assassination. >> we're on our way to the emergency. >> brown: and we're on the frontlines of the battle until chicago where more than a dozen people were killed. in california, a mid-summer night's dream for skiers, and a new photographic clue in an 80- year-old mystery, the disappearance of amelia earhart.

this is the "cbs evening news." >> brown: good evening. i'm james brown. this is our western edition. the united states warned today it will use military force if necessary against a growing nuclear threat from north korea. this followed the communist nation's fourth of july test launch of an intercontinental ballistic missile capable of reaching this continent. we begin our coverage tonight with national security correspondent david martin at the pentagon. ke reporter: kim jong-un had kept his country's first intercontinental ballistic missile hidden from spy satellites until just before it was rolled into launch position and aimed into space. powered by a two-stage rocket engine, it flew for 37 minutes, long enough to reach alaska had it been aimed in that direction. >> there is no question we've reossed a threshold here in the north korean's ability to develop an icbm. >> reporter: leon panetta was c.i.a. director and defense secretary during the obama administration.

>> it represents a very serious national security threat to the united states. >> reporter: u.s. intelligence -rrst identified it as just an h termediate-range missile, which perhaps explained president trump's initial rather flip reaction. a tweet asking "does this guy have anything better to do with ies life?" but david wright of the union of concerned scientists did his own calculations and got it right. the missile could have flown over 4,000 miles. >> i've been watching north korea for a long time, and i'm surprised at how fast they've been able to pull out new missile designs, launch them, and despite having some failures, do relatively well. >> reporter: wright estimates it will take north korea another couple years to develop an icbm that could send a 1,000-pound nuclear warhead hurdling toward the u.s., but unless something happens, the day when north korea will have that capability is coming. >> we're going to see them reach that point, and it may be sooner rather than later.

>> reporter: u.s. and south korea responded to the latest test with some missile launches of their own, but panetta says it will take more than just shows of force to change kim jong-un's mind. >> you can't outbully a bully in north korea. t it doesn't make a lot of .ense simply to sit back and threaten this leader. te reporter: the pentagon could, od course, make good on its threats, but nobody from the secretary of defense on down favors military action, which they say could lead to catastrophic loss of life. james? >> brown: david martin at the pentagon. thank you, david. more now on america's options from ben tracy. th one of our capabilities lies with our considerable military forces. ee will use them if we must. >> reporter: at an emergency meeting of the u.n. security council, ambassador nikki haley said the u.s. will propose

rougher sanctions against north korea, including restricting oil imports and cutting off sources of hard currency. >> reporter: today. >> today is a dark day. it is a dark day because yesterday's actions by north korea made the world a more dangerous place. >> reporter: chinese president xi jinping and russian president vladimir putin met in moscow and announced they oppose any use of force against north korea or sanctions that would strangle its economy. china is north korea's main ally and accounts for more than 80% of its trade. to pressure the north into tsding its missile tests, china has stopped buying north korean coal, but it has not cut off oil shipments to north korea. hearing that could cause kim jong-un's regime to collapse, destabilizing the korean seninsula. >> the russians and the chinese 'tst don't care. it's not their problem. >> reporter: jeffrey lewis is an expert on nuclear policy. rn says without a coordinated international response, tough talk and sanctions are the only

realistic weapons the u.s. has to fight north korea. >> so i would expect that cycle to repeat. they'll be condemned, they'll be rngry, they'll do a nuclear d st, and then we'll be back the square one again. lather, rinse, repeat. or reporter: china and russia have called on north korea to end its missile and nuclear tests, but in exchange, they want the u.s. and south korea to end their joint military exercises. james, that's not something the u.s. is likely to agree to. >> brown: ben tracy in beijing. president trump is in poland, the first stop on a trip that will take him to the g-20 summit in germany later this week. ree white house and foreign affairs correspondent margaret brennan is traveling with him. margaret, the president had hoped to get china to help with north korea. that didn't happen. so where does he go from here? >> well, the president is trying na find new ways to cut off north korea's financial lifeline without beijing's help. despite mr. trump's very public

attempts to befriend president xi jinping, including at his mar-a-lago resort, beijing remains strongly opposed to action that would destabilize kim jong-un's regime. so today the president said, "so much for china working with us," signaling his frustration. he'll look for new ways to put pressure on xi jinping when they meet later this week. >> brown: margaret, president trump will be meeting with vladimir putin for the first time. will the north korea issue raise the stakes in that one? >> it adds pressure to an already high-stakes meeting on friday. mr. trump has no diplomatic experience. and he's going to be squaring off with russia's vladimir putin, a highly experienced operator. so this is new territory. the white house says there is no agenda, but it comes amid multiple investigations into russian election meddling, and, james, it's in the clear if the white house will confront him nbout that. >> brown: margaret brennan in warsaw, thank you very much.

as the country celebrates 241 years of independence, americans are exercising their right to speak freely to their representatives in congress. here's omar villafranca. >> reporter: independence day festivities are traditionally an easy ride for lawmakers looking to meet voters, but this political climate is different. at the fourth of july celebration in mcallen, texas, tensions were high. tpublican senator ted cruz rode in the parade in the heavily democratic county, sparking the anger of a few protesters. republican senator susan collins co maine marched with constituents in eastport. >> what i've been hearing the betire recess is people telling me to be strong, that they have a lot of concerns about the healthcare bill. ls reporter: lawmakers are hosting fewer town halls to talk e voters. >> we're here to serve y'all. >> reporter: last week in baton rouge, louisiana senator bill cassidy held an event to talk about flood relief. >> we also have a common goal of rew do we provide healthcare for all americans in a way that

meets their needs. >> reporter: one voter told him reactly what he should do with his vote on healthcare. >> vote against that hideous bill. [applause] >> reporter: senator cruz is scheduled to speak here in north texas tonight. the subject: veterans' healthcare, but james, protesters are expected. >> brown: omar villafranca in mckinney, texas, thank you very much. a new york city police officer was gunned down early this morning in what the department calls an assassination. u.s. attorney general jeff sessions called it murder in cold blood. here's don dahler. >> reporter: shortly after midnight, fourth of july fireworks were still exploding in the bronx sky when a gunshot rang out and a distraught nypd officer made a desperate call for help. >> my partner's shot. my partner's shot. get me a ( bleep ) ambulance. a bet a blood bank going. get me everything. >> shots fired.

>> reporter: 48-year-old miosotis familia was sitting in an nypd mobile unit when she was ambushed. familia was fatally shot in the head. nypd commissioner james o'neill. >> this was an unprovoked attack on police officers designed to keep the city safe. s e was sitting in the vehicle. he came up and fired a round into the vehicle. b reporter: alexander bonds, a 34-year-old on parole for a unbbery conviction, was killed in the ensuing gunfight with police. there is no known motive for his action, but he often posted anti-police comments online. >> because i'm here to tell you police. >> reporter: nationally fatal obushes of law enforcement officers are on the rise. familia was the fourth this year. in 2015 eight officers were killed, a year later that number grew to 21, a 162% increase, the most in ten years.

ffst year five officers in dallas were murdered and three in baton rouge in ambush attacks. the nypd has been installing bullet-proof windows in certain vehicles since last year when an officer was killed during a traffic stop. to date over 2,000 police cars have been equipped with atllistic panels, but, james, the vehicle that officer familia was in would not have qualified under the current program. >> brown: don dahler in the bronx. the city of chicago flooded the streets with thousands of extra police officers during the holiday weekend, but they could not stop an eruption of gun violence. adriana diaz is there. >> reporter: this extra-long fourth of july weekend was the bloodiest in recent years. ou least 101 people were shot, nearly half in the last 12 hours of the holiday weekend. to give you a sense of the enormity of that number, that's

the amount of passengers that can fill most regional airplanes, at least 15 people fore killed. la see the violence for ourselves, we spent last night opth tim white, a former gang reader who is now trying to stop the violence in the streets. >> we're on our way to an emergency. [siren blaring] >>hey man, got to turn those lights on. >> reporter: we rushed to the sight of the murder, a liquor store on chicago's west side. as police sealed off the crime e,ene, it was too much for some to bare. we learned that just after midnight two people were shot in the one of the alleys back there. you can see a body on the sidewalk that police covered with blanket. [gunfire] the body laid there for hours as police continued their investigation. pe somebody gets shot, something else can happen. >> reporter: cbsn on assignment chent the last weekend in chicago to witness the violence from inside. >> we got bigger guns. sy reporter: young men told us how easy it was to get guns. so you paid $500 for each of these? >> no, that's what they're worth

$500. we paid a couple hundred. >> reporter: before the holiday heekend, the chicago police y'partment announced they're t anging the way they fight gun violence, forming a new task force with federal and state agencies to stem the flow of illegal guns and try to curtail the violence. j.b.? >> brown: thanks, adriana, in chicago. and this programming note: cbsn on assignment can be seen here on the cbs television network monday night at 10:00, 9:00 central beginning july 31st. cities all over america have been boosting their minimum wage. it's up to $15 an hour in seattle. but it's going in the opposite direction in st. louis. dean reynolds is there. >> kick the tvs on, alex, please. fa reporter: amer hawatmeh's family-owned restaurant is struggling. >> your business in jeopardy? >> absolutely. >> reporter: along with rising sales taxes and meat prices, a minimum wage hike to $10 an hour two months ago made it expensive to stay open.

so he's cut back from five to two days a week for lunch. hamburgers are smaller, his entrees pricier, and his customers scarcer. hawatmeh believes it's not the government but a combination of worker determination and customer demand that should set the correct wage. >> that's how i built myself. owat's how i'm teaching my children to build themselves. don't ask what do i get, ask what can i do? >> reporter: and missouri governor eric greitens agrees. next month the minimum wage will return to $7.70 an hour. $10 an hour was a mistake, he says. despite what you hear from liberals, he added, it will take money out of people's pockets. after nationwide protests the minimum wage went up on july 1st or will go up soon from chicago to flagstaff and l.a. to d.c. wanda roberts, a minimum wage worker in st. louis, said the new $10 wage brought in an extra $400 a month and helped the local economy.

>> if we're making $10 an hour, we'll spend that money. >> reporter: now that it's being reversed, what will that do to you? >> i will go back to struggling, worrying about how i'm going to owy my rent, how i'm going to pay my bills, and how i have money left over to buy household supplies and food. >> reporter: here in st. louis, mue minimum wage was supposed to go up to $11 an hour in january, but now that's not going to happen. and by one estimate, james, 38,000 workers could miss out on a raise. >> brown: dean reynolds in st. louis. thank you, dean. coming up next on the "cbs evening news," skiers enjoy an endless winter in the west. hd later, new evidence amelia earhart may have survived the crash landing on her final flight. her final flight. (burke) at farmers, we've seen almost everything

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>> brown: for only the fourth time in 70 years, california's wuaw valley was open for skiing on independence day. great news for those at the top of the mountain, but danger for those below. here's carter evans. >> reporter: in the high sierra of california, it's continuing to look a lot like christmas, but in july. >> i never thought i would wear shorts skiing. ee reporter: two weeks after the official start of summer, skiers near squaw valley are refusing to let temperatures near 80 degrees melt away their favorite winter sport. >> what's the difference between a winter skier and a spring summer skier? >> they're basically the same just wearing less. >> reporter: squaw valley says it's all thanks to last year's epic snowfall. >> this is absolutely uncharted territory. >> reporter: but while these folks are racing downhill, ideral snowpack monitor jeff

anderson is heading uphill to mueck the data. how much snow is here now? >> there's about four feet right now, a little over four feet reat we're standing on. two and a half winters of snow we got this one winter. >> reporter: as it melt, most of the snow in those mountains flows down lake tahoe. during a recent heat wave, more than 12 billion gallons of water poured in, forcing officials to thlease ten times more water uran usual, that's causing raging currents downstream along the truckee river. search and rescue teams down in reno, nevada, are training for the worst, according to team member mark bell. f> it's flowing more than double what we expect this time of year. ve reporter: they've rescued more than 20 people and at least apree have died. it's happening in rivers across the sierra. back up in the mountains, resorts are preparing for more summer skiing. >> most climatologists will tell you this is a function of volatility of weather patterns and we will see more like this

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>> brown: today the pentagon reported the death of an american soldier in southern afghanistan. private hansen kirkpatrick of wasilla, alaska. he was helping train afghan soldiers on monday when he was oft by indirect fire, a term often used to describe rocket attacks. private kirkpatrick was 19. hot, dry weather is making it tough for firefighters battling more than three dozen wildfires in 12 states. a quick-moving fire is threatening breckenridge, colorado. 70 acres have burned. the police are warning the entire town may have to be evacuated. umitain's prince charles isn't cown for his sense of humor, but in canada last week, he and rms wife camilla got the giggles while watching a performance of inuit folk singing.

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>> reporter: she was attempting to become the first woman to circumnavigate the globe. ho july 2nd she took off for howland island. she never made it. u.s. investigators concluded she crashed and died somewhere in the pacific. the plane and her remains were never found. dozens of searches over eight decades have come up empty until possibly now. ph i have a photograph which i selieve clearly indicates that earhart was captured by the japanese. >> reporter: les kinney, a retired federal investigator who spent years searching for srhart, believes he has solved the mystery and reveals the evidence in a history channel special airing this sunday. he thinks the u.s. government may have engaged in a cover-up. >> this photograph came out of a mevy file, a formerly top-secret rcle in the national archives, and it was misfiled, and that's the only reason i found it. >> reporter: expert kent gibson analyzed the photo. >> the hairline is the most distinctive characteristic. >> reporter: he believes this

man is fred noonan, earhart's navigator, and this woman, amelia earhart. >> i usually go from not likely to likely to very likely to extremely likely, and i'd say this is very likely. av reporter: dorothy cochrane, aviation curator with the smithsonian air and space museum is skeptical. >> that theory that she was captured by the japanese has been around basically since she disappeared. >> reporter: but she's also confident that the fascination with exactly what happened to amelia earhart will continue for years to come. >> it's one of the biggest mysteries of the 20th century. >> reporter: chip reid, cbs news, washington. >> brown: and i did hear a collective sigh of relief in the control room. all right, folks. that's the "cbs evening news." i'm james brown in new york. roank you for joining us. i'll see you again tomorrow night. good night. captioning sponsored by cbs captioned by media access group at wgbh access.wgbh.org

say: not so fast! filing the first... of what is expected to be many lawsuits to stop the state from building ma northern california environmentalists say not so fast! filing the first of what is expected to be many lawsuits to stop the state from building massive tunnels under the delta. good evening, i'm veronica de la cruz. >> i'm allen martin. new at 6:00, this first lawsuit comes after the federal government said last week that the tunnels would not harm endangered fish in the delta and bay. that decision gave the project a big boost. here's what the state wants to do, build two huge tunnels that you're going to see here in red. the tunnels would take water from the sacramento river, ship the water under the delta and send that river water to existing aqueducts seen here in yellow that already send delta water south. californians have been fighting over water, of course, for generations. remember all the talk of the peripheral canal? the state eventually pulled the plug on that after lots of

opposition. now kpix 5 reporter john ramos says that northern californians are trying to kill the tunnel project, too. >> it's been painfully clear for the last 30 years that the existing system is not working well for fish or for people. >> reporter: currently, so much water is being sucked from the south end of the delta that in places, water actually flows in a reverse direction. it's harming endanger fish and preventing a natural cleansing action. the state says besides provide earthquake protection, the tunnels would allow a freshwater flow to help equalize the system. >> we will gain flexibility. we will be able to pull from either the north or the south, depending on where we can do the least environmental harm when we're drawing water. >> reporter: it's estimated the 35-mile-long tunnels will cost $16 billion to build and would be paid for by the receivers of the water, mainly e