Announcer from nbc news World Headquarters in new york, this is nbc nightly news with lester holt. Good evening. We were warned that this upsetting ride wasnt over, and the markets proved that in dramatic fashion today. What looked like a spectacular comeback run after mondays wall street wipeout stumbled badly at the finish line. The markets falling into even deeper negative territory this afternoon, with the dow shedding another 205 points. And so these are confusing times for a lot of americans trying to protect their hardearned savings. On one hand, the value of their investments is falling. On the other, indicators that might suggest our economys doing just fine. Cnbcs Carl Quintanilla is here with the big picture. Hello, carl. Hello, lester. Today was not encouraging. Stocks are down six days in a row for the first time in three years and a growing sense that more dramatic days lie ahead. It was the biggest opening rally of the year. A quick 400point gain on the dow, seen here on the right. Almost the mirror image of mondays collapse on the left. But it couldnt hold. And since friday the dow has fallen 6 , climbed 5 , and fallen again. Thats a wider range than stocks have seen all year. You will see markets trading around up and down for several days. These things are rarely resolved on a single day. Reporter that Early Morning attempt courtesy of china, which cut Interest Rates overnight to give their slowing economy a boost. And some positive news back home. Good earnings from best buy, a strong Consumer Confidence survey. Some investors said mondays selloff was so violent theres simply not much damage left to be done. I dont think its going to have a very serious downward direction from here, no. I think there will be lots and lots of volatility. Reporter thats because of a wild card, the federal reserve. Its kept Interest Rates near zero for years, since the crisis. And while thats helped the u. S. Recover, some argue its created too much risk as investors took advantage of all that cheap money, plowing it into oil drills, real estate, stocks, and even startups. If the fed hikes rates next month or next year, the economy will increasingly have to stand on its own. Would not be surprising to me if were sitting here a year from now and 25 of the startups are gone. Reporter now, very few on wall street expect a fullblown recession in this country, but if stocks continue to decline we may begin to talk about the effect on Consumer Sentiment and spending. Lester . Carl, lets go back to that wild card you mentioned that the feds may raise Interest Rates. Do we think thats going to have a lot to do with whether people should refinance quickly or buy a house . Reporter well, fed officials have said they can envision a rate hike by the end of the year but that it would be slow and gradual. But yes, once rates begin to rise those mortgages will get more expensive too. Carl quintanilla, thank you. Officials in france have opened a formal terrorism investigation into that attack aboard a highspeed train. Theyre saying now theres clear evidence the gunman stopped by those americans on board planned to carry out mass murder and has apparent ties to radical islam. And now Authorities Say someone was helping him. Nbcs Kelly Cobiella has the latest. Reporter ayoub el khazzani, barefoot and blindfolded, was led into the french courthouse today, where he was charged with attempted murder, attempted mass murder, and membership in a terrorist organization. This was premeditated and targeted, the prosecutor said, detailing el khazzanis alleged arsenal. An akm assault rifle, nine clips fully loaded with 270 rounds, an automatic luger m80 handgun and a loaded clip, a box cutter, a bottle of gasoline, and a cell phone. The prosecutor said el khazzani bought a 170 firstclass ticket and while on board listened to a youtube clip calling on the faithful to take up arms. On what appears to be his Facebook Page one post calling france a terrorist civilization and a criminal state. Investigators are still looking into whether el khazzani acted alone and who supplied the money and weapons. What we dont really know is the degree to which someone directed him to do this plot, the degree to which he decided to do this much more under his own volition, or what the kind of overarching plan was. Reporter two of the four americans credited with thwarting that plan kept a low profile today after a heros welcome at ramstein air base. Here in germany, Airman Spencer Stone saw military doctors today. His mood described as upbeat. And hes expected to regain full movement in his hand. Anthony sadler was on the red carpet for a movie premiere in paris last night. I feel like im in a dream. This is unreal. Two days ago we were just on the train, and two days later all this has happened. Its pretty crazy. Reporter today it was back to reality. Sadler and his parents flew back to the united states. A parade is being planned for sadler and his friends in sacramento. But as for that fourth american, mark moogalian, french media reporting tonight that his condition is worrisome. Lester . Kelly cobiella tonight, thank you. A new war of words has erupted between the gop frontrunner donald trump and fox news after trump went on another tirade against fox news host megyn kelly and the Cable Networks man in charge is now firing back, calling trumps words disturbing and demanding that trump apologize. Our National CorrespondentPeter Alexander has more. Unbelievable reporter its the intercession of reality tv and president ial politics. Donald trump and fox news reigniting the feud that began at the gop debate three weeks ago. This afternoon fox chief roger ailes demanding trump apologize for his latest twitter tirade against host megyn kelly, just back from vacation. Welcome to the kelly file, everyone. Im megyn kelly. Reporter last night trump tweeted liked the kelly file much better without megyn kelly and retweeted others that dismissed her as a bimbo and a waste. Kellys colleagues rushed to her defense. On air. Something totally out of control yesterday. He started tweeting against megyn kelly totally unwarranted. Reporter and online. Leave megyn kelly alone. And this needs to stop. It started here. Youve called women you dont like fat pigs, dogs, slobs, and disgusting animals. What i say is what i say. And honestly, megyn, if you dont like it, im sorry. Reporter from there it went downhill. You could see there was blood coming out of her eyes. Blood coming out of her wherever. Reporter the two sides had seemingly reached a truce after the debate in an ailestrump phone call, trump calling ailes a great guy, ailes insisting the airs been cleared. Apparently not. This afternoon ailes teed off on trump for his verbal assaults on kelly last night, calling it an unprovoked attack thats as unacceptable as it is disturbing. Trump shot back, insisting he totally disagrees with ailes defense of kelly and said he doesnt think shes a quality journalist. At the same time touting his lead in the latest poll from south carolina. And feuds not unlike those on reality tv have come to define the trump campaign. How real is this one . Thats anybodys guess. But everybodys watching the spectacle, and at least for the moment both sides seem to be benefiting. Lester . Peter, thank you. A scary scene at a West Virginia high school today. Police say a 14yearold boy with a gun held 27 students and a teacher hostage in a classroom. The rest of the building was evacuated as authorities negotiated with the teen, who eventually let everyone go before giving himself up. Police say hes been taken to the hospital for an evaluation. Theres no word on what sparked this incident. The racing world is in mourning tonight after indycar driver Justin Wilson died from injuries he suffered in a horrific crash on the track sunday. This is obviously a highrisk sport, no doubt, but this tragedy raises the question what can be done to make it safer to give drivers a bit of an edge . Nbcs craig melvin takes a look. Reporter at 64 Justin Wilson was indycars tallest driver and one of the sports most popular stars. Justins elite ability to drive a race car was matched by his unwavering kindness, character, and humility. Gone reporter during sundays race another driver lost control of his car and slammed into a wall. A heavy piece of debris from the front of that car struck wilsons head as he drove by, knocking him unconscious. Justin wilson. Reporter the england native was airlifted to a nearby hospital. He never came out of a coma and died late monday. The way wilson was injured here at pocono is raising new questions about safety in a sport where drivers hit top speeds of more than 200 miles per hour. Here we go. Huge crash. Reporter for indycar its the second death in just four years. In 2011 fellow british driver dan wheldon died of severe head injuries in a terrifying crash. New measures like impactabsorbing barriers and head and neck protection can help, but some drivers want more. With the open cockpit like that its one of the most dangerous formds of motor sports. We know we go out there every day taking that risk with our head exposed. Reporter indycar officials have considered changes like a canopy shielding the cockpit. But racing experts arent sure it would have saved wilson. It really was a freak accident. And debris flying around in indycars isnt a common problem. Reporter meanwhile, the tightknit racing family is embracing wilsons. With drivers like nascars Danica Patrick tweeting, he was a good man. A great man. I had the pleasure of knowing him and pray for his family. Wilsons brother and fellow indy driver stephen told family and friends tuesday his brothers donated organs saved six lives. Craig melvin, nbc news, long pond, pennsylvania. Were keeping a close eye on a new Tropical Storm that has formed in the atlantic. Tropical storm erika is forecast to strengthen into a category 1 hurricane as it moves west across the caribbean, where it could pass over the bahamas this weekend. From there the forecast gets a bit more uncertain. One model showing the storm dissipating. Another showing it possibly becoming a threat to parts of the southeastern u. S. Next week. Well keep you posted on that. Reinforcements from a hemisphere away are now joining the firefight in the west. Crews taking all the help they can get in this year of historic loss. Its been one step forward, two steps back for firefighters as several wildfires continue to gain ground. Nbc news National CorrespondentMiguel Almaguer has more from Washington State. Reporter in Washington State theyve never seen conditions like this. Wildfires are exploding. As crews race to build containment lines. Across the state 12 large fires. This year a record pace. 1,100 square miles torched and counting. More land than the entire state of rhode island. Few know fire better than stewart turner. The 34year veteran is a fire behaviorist. A lot of red on this map. Theres a lot of red. Thats all fire. And thats just our fire. Reporter turner predicts where and how fast this fire will go. This one is driven by those dry, dry fuels out there. The rugged terrain and then the weather, the winds. They all make sure extreme behavior. Reporter turner works side by side with meteorologist christian casill studying maps, models and radars 16 hours a day. Critical work to keep firefighters safe. Winds here will change dramatically. Theyll either go one way and then, you know, within ten minutes theyre gusting pretty hard. Reporter in the field, gearing up, teams from australia and new zealand to help fight this historic fire. Feels good to be able to assist you guys when you need a hand and hopefully you can do the same for us when we need one too. Reporter tonight with more homes threatened dorothy heinzelman grateful for what she still has. They did a wonderful job. A wonderful, wonderful job. And saved our house. Because it would have gone. Reporter Miguel Almaguer, nbc news, chelan, washington. Isis has released images to back up claims that it destroyed an ancient temple in the syrian city of palmyra, sending it up in a mushroom cloud. Other pictures appear to show militants rigging barrels of explosives around the site and also the aftermath, a temple reduced to a pile of rubble. Awful scenes of destruction and the brutality of isis spreads far beyond palmyra. When we come back, a powerful nbc news exclusive. Richard engel uncovering isis, the systematic brainwashing of an army of children. And what happens when children try to escape or hide . Also chaos on the highway. Shocking new video of a driver barreling the wrong way into oncoming traffic. The wild scene. Police scramble to stop a tragedy from happening. Listen up team, i brought in some protein to help rearrange the fridge and get us energized im new ensure active high protein. I help you recharge with Nutritious Energy and strength to keep you active. Come on pear, its only a half gallon. Ill take that. Yeeeeeah new ensure active high protein. 16 grams of protein and 23 vitamins and minerals. All in 160 calories. Ensure. Take life in. Every time you take advil youre taking the medicine doctors recommend most for joint pain. More than the medicine in aleve or tylenol. 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If you have any sudden decrease or loss in hearing or vision, or any symptoms of an allergic reaction, stop taking cialis and get medical help right away. Ask your doctor about cialis for daily use. Insurance coverage has expanded nationally and you may now be covered. Contact your health plan for the latest information. Ugh heartburn no one burns on my watch try alkaseltzer heartburn reliefchews. They work fast and dont taste chalky. Mmm. Amazing. I have heartburn. Alkaseltzer heartburn reliefchews. Enjoy the relief. Back n back nowow with our special series isis uncovered. Tonight an exclusive look at isiss child army. Young people taken and brainwashed into the terror groups twisted ideology. For those who manage to escape with their lives getting away comes with a hefty price. Nbcs chief Foreign CorrespondentRichard Engel has the story. And we need to warn you, some of these images may be disturbing. Reporter when isis took over Eastern Syria last year, it started to hunt down the rebels whod been fighting it. Searching especially for their children. Ahmed now 17 eventually turned himself in. They said if i went with them, gave up my weapon, that i would be unharmed, he says. Another boy, mohammed, tried to run. After they found me, he says, i faced all kinds of torture. Beatings and electric shocks. Both boys have now fled to the turkish city of urfa. Syrians escape here to turkey to get away from the war. But they cant get away from isis. The group has members all over this side of the border, which is why few here dare to speak about its crimes without hiding their faces. After surrendering to isis, ahmed went to an indoctrination course like this one, filmed by the group for propagan propaganda. They talked about Osama Bin Laden and how he attacked the twin towers. They were saying that they need to do that again, he says. This is what isis does to those who refuse to bow to it. Its a gruesome public ceremony filmed by the group itself in which the victims right hand and left foot are chopped off. Thats exactly what they did to mohammed, who is only 14 years old. I put my arm on a tab table, and they brought in the butcher, and he cut it, he says. This, mohammed says, is the man who disfigured him two weeks ago. An iraqi nicknamed the bulldozer. The most difficult time is when i go to sleep, he says. Then the pain starts. Mohammed cries when his bandages are changed. He cant afford to go to a hospital. Isis, he says, is turning children like him into human bombs. They give a boy some money or a bicycle and then take him in a car to bomb himself. They target children the most, mohammed says. Isis is creating a new generation of extremists and brutalizing those who dont go along with the plan. Richard engel, nbc news, southern turkey. 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