captioning sponsored by cbs >> mason: 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. >> mason: also tonight, a deadly holiday weekend. >> it is clear this was an unprovoked attack. >> anchor: a new york cop is gunned down in what police call an assassination. >> we're on our way to the emergency. >> anchor: and we're on the frontlines of a gun bat 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."

>> anchor: good evening. i'm james brown. 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. >> 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 crossed 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 first identified it as just an intermediate-range missile, which perhaps explained president trump's initial rather flip reaction. a tweet asking "does this guy have anything better to do with his 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, an 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. so it doesn't make a lot of sense simply to sit back and threaten this leader. >> reporter: the pentagon could, of 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? >> anchor: david martin at the pentagon. thank you, david. more now on america's options from ben tracy. >> one of our capabilities lies with our considerable military forces. we 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 tougher 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 ending 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 peninsula. >> the russians and the chinese just don't care. it's not their problem. >> reporter: jeffrey lewis is an expert on nuclear policy. he 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 angry, they'll do a nuclear test, and then we'll be back the square one again. lather, rinse, repeat. >> 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. >> 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. the 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 to 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. >> anchor: 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. he'll 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 about that. >> anchor: margaret brennan in warsaw, thank you very much. as the country celebrates 24 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. republican senator ted cruz rode in the parade in the heavily democratic county, sparking the anger of a few protesters. republican senator susan collins of maine marched with constituents in eastport. >> what i've been hearing the entire recess is people telling me to be strong, that they have a lot of concerns about the healthcare bill. >> reporter: lawmakers are hosting fewer town halls to talk to 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 how do we provide healthcare for all americans in a way that

meets their needs. >> reporter: one voter told him exactly 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. >> anchor: 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 [bleeped] ambulance. >> get 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. nyp d commissioner james o'neill. >> this was an unprovoked attack on police officers designed to keep the city safe. she was sitting in the vehicle. he came up and fired a round into the vehicle. >> reporter: alexander bonds, a 34-year-old on parole for a robbery 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 ambushes of law enforcement officers are on the rise. familia was the fourth this year. in 2014 eight officers were killed, a year later that number grew to 21, a 162% increase, the most in ten years. last year five office centers 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 ballistic panel, but, james, the vehicle that officer familia was in would not have qualified under the current program. >> anchor: 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. at 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 were killed. to see the violence for ourselves, we spent last night

with tim white, a former gang leader who is now trying to stop the violence in the streets. >> we're on our way to an emergency. [siren blaring] >> >> reporter: we rushed to the sight of the murder, a liquor store on chicago's west side. as police sealed off the crime scene, 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 bank et. [gunfire] the body laid there for hours as police continued their investigation. >> somebody gets shot, something else can happen. >> reporter: cbsn on assignment spent the last weekend in chicago to witness the violence from inside. >> we got bigger guns. >> 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 weekend, the chicago

police department announced they're changing 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.? >> anchor: 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, breeze. >> reporter: amer hawatmeh's family-owned restaurant is struggling. is your business in jeopardy? >> absolutely. >> reporter: along with rising sales taxes and meat price, paige 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. that'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 liberal, 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 paige worker -- 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 pay 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, the paige 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. >> anchor: dean reynolds in st. louis. thank you, dean. coming up next on the "cbs evening news," skiers enjoy an endless winter in the west. and later, new evidence amelia earhart may have survived a crash landing on her final flight.

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>> brown: for only the fourth time in 70 years, california's squaw 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. >> 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 different between a winter skier and a ski 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, federal snowpack monitor jeff anderson is heading uphill to check the data. how much snow is here now? >> there's about four feet right

now, a little over four feet that 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 powshed in. -- poured in, forcing officials to release ten times more water than 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. >> it's flowing more than double what we expect this time of year. >> reporter: they've rescued more than 20 people and at least three have died. it's happening in rivers across the cierre ramp back up in the mountains, reports 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 going forward. >> reporter: carter evans, cbs

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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 hit 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. britain's prince charles isn't known for his sense of humor, but in canada last week, he and his wife camilla got the giggles while watching a performance of inuit singing.

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on 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. >> i have a photograph which i believe clearly indicates that earhart was captured by the japanese. >> reporter: les kinney, a retired federal investigator who spent years searching for earhart, 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 navy file, a formerly top-secret file 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 in the likely to likely to very likely to extremely likely, and i'd say this is very likely. >> reporter: dorothy cochrane, aviation curator with the smithsonian air and space museum is sceptical. >> 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. thank you for joining us. i'll see you again tomorrow night. good night.

tonight -- >> whoo! >> j-rod's romance fireworks. ♪ from backstage secrets to their rockin' house party. what we just found out about their pda weekend in new york. >> happy fourth of july, everybody! plus, inside ben and jen's independence day reunion, and why taylor swift gives her legendary backyard bash. then -- brittany sings live to shut down lip sync rumors. and then jeremy meeks is in hot water again, and celine dion stripped down. ♪ >> why she is bearing all in her sexy new photo shoot as she storms paris fashion week.