Hidden danger in the water. Female, electrocuted, unconscious, breathing. Two young People Killed over the weekend, an 11yearold and 19yearold dying in separate incidents after jumping in lakes, shocked by elecectric currents. The new warning this summer. And severe storm outbreak. 60 million americans in the threat zone this morning after torrential downpours, powerful winds and damaging hail stretch from texas to vermont. This truck flipping over. These homes destroyed. Now the threat moving east and the new tropical systems brewing that could impact the gulf coast. And we do say good morning, america. George taking a little Vacation Time this week. Great to have david here with us on a very busy, busy monday morning and 60 million americans are on alert for that Severe Weather, michael. Yep, and millions more, robin, are cleaning up this morning. Take a look at this damage in nebraska after two tornadoes moved through that area. Just incredible, were thinking about all those families. Also much more ahead. The breaking news, unbelievable to see this headline break overnight. Another terror attack in london. This is the fourth now in three months. The assailant using a van to target muslims leaving a mosque. At least one person dying, ten irn injured this morning. Londons mayor calling it a deliberate attack. Terry moran is on the scene. Terry, good morning. Reporter good morning, david. We are in the north London Community of Finsbury Park and behind me here you see this grimly familiar scene, the Police Cordon behind them investigators at the scene of this latest terror attack. That white van, rented van right around the corner slammed into a crowd but this time the victims were people emerging from their nighttime prayers, the hatred directed at ordinary british muslims. Overnight, terror strikes london again, at least ten injured and one dead on the scene possibly unrelated to the attack. A crowd of worshipers leaving evening prayers targeted in a malicious attack. At 12 15 a. M. Authorities already calling it a major incident. A white van on Seven Sisters road in north london suddenly accelerating veering off the road ramming into the pedestrians leaving behind a trail of broken and bloodied victims and bystanders wrestled the suspect pinning him down until officers arrived. He asked why did you do that, why, you know, innocent people. He goes, i want to kill muslims. Reporter within Minutes Police and emergency crews were swarming the scene shutting down the scene. People tended to the injuring administering chest compressions at the scene. It started as a night of worship. Mosque members are seen here just moments before their night of prayer turned deadly. Horrified nearby residents described a scene of carnage. This latest incident comes as the city of london is still on edge. Officials now call this a terror attack. And it is the fourth terrorist attack in Great Britain this year. Just two weeks ago a white van driving on a London Bridge plowed into pedestrians, the attackers then going on a deadly stabbing spree. This morning, Prime Minister theresa may saying this is a terrible incident. All my thoughts are with those who have been injured. After that van came to a stop right back there, the driver, the alleged attacker was grabbed and pinned to the ground and some in the shocked and angry crowd were calling for blood until a local imam said, do not touch him, hand it over to police and that probably saved this alleged attackers life. Also overseas, the situation growing more tense in syria this morning after a u. S. Fighter jet shot down a syrian warplane on sunday. Thats the first time the u. S. Has shot down a syrian jet since the conflict began and the first u. S. Airtoair shootdown in nearly two decades. Martha raddatz has more details for us and joins us from washington, good morning, martha. Reporter good morning, robin. This is something u. S. Fighter pilots train for all the time, an airtoair shootdown but the last time they actually executed this move was in kosovo so this is a dramatic turn in syria. The american f18 fighter jet launched from a nearby carrier locked on to the syrian jet after it dropped bombs on u. S. Backed rebel forces fighting isis. Firing that airtoair missile and shooting the syrian warplane out of the sky. The shootdown coming after the u. S. Warned the syrians through the russians to halt their assault on the forces. The u. S. Called the russians on a hotline and said stop attacking, minutes later a syrian jet rolled in and it continued to attack the sdf forces on the ground. Reporter the u. S. Military said the shootdown was justified as part of the collective selfdefense of Coalition Partner forces fighting isis but further complicating u. S. Relations with russia which is backing the assad regime. The best case here is that the syrians and the russians say, okay, weve pushed the u. S. As far as they can go and theyve drawn a line and were not going to cross this again. On the other hand, if mr. Putin decides to escalate this, it now becomes a potentially very dangerous confrontation between the u. S. And Russian Military forces. Reporter and this morning, the Russian Foreign ministry is now responding, calling this an act of aggression by the United States and a direct breach of international law. David, this is something to watch carefully in the coming days. And youll be watching it, martha raddatz, our thanks to you this morning. Now to the search for answers after a deadly coalition at sea between a u. S. Navy destroyer and a cargo ship that killed seven navy sailors, were learning new details about the victims and the crash, abcs matt gutman has the latest for us. Good morning, matt. Reporter good morning, david. The navy is calling this one of the worst at sea disasters in decades and abc news has learned theres already four commissions investigating it. A hellish collision and then effort trying to save the uss fitzgerald from going down. Overnight the navy releasing the names of the seven sailors found dead in the mangled midsection. They range in age from 19 to 37, their hometowns spanning the country, from connecticut to california. But this morning, authorities are trying to figure out why multiple maritime trackers show the acx crystal cargo ship completing a giant uturn just minutes before colliding with the naval vessel. Now, a new twist, the acxs Charter Company denied it pulled the uturn and claiming the incident happened 50 minutes earlier than the navy. The navy saying the discrepancy is one of the things four investigative bodies will examine but the fundamental question remains, how an islandsize container ship managed to tbone one of the navys most sophisticated ships . The navy says at 2 20 saturday morning, the 30,000ton container ship nearly gutted the uss fitzgerald. The ships bulbous bow slamming right into the berthing quarters where over 100 sailors sleep slicing open a tenfoot section. The water flow was tremendous and so there wasnt a lot of time in those spaces that were open to the sea. Reporter many trapped inside as the water rose. The Captains Quarters also hit. He and two others medevacked. The mother of one of the surviving sailors telling abc news her son and many others fought for hours to save one of the navys most sophisticated missile ships from sinking. They had to fight the ship to keep it above the surface, so it was traumatic. Reporter the investigation will hinge on two major questions, how such a ship with some of the best radar in the world and multiple officers tasked with watching it failed to notice a stadiumsize cargo ship approaching and why this happened. Military officials telling me everything is on the Table Including the possibility this may have been intentional or even a terrorist attack, david. More to come on that. Still such a mystery but so many young sailors lost in that accident. Heartbreaking. All right, well keep our eye on that. Now to the Severe Weather moving across the country. Tornadoes, flash flooding and more. Its been damaging homes from texas to vermont and well go to ginger tracking it all. Good morning. Michael, ef1 and ef2 tornado in bellevue, nebraska. This was the damage. Those were just 2 of more than 500 severe storm reports over the weekend. You can see them there now with all eyes on the east coast for later today. A weekend of severe storms. From flash flooding in kansas city to cars floating in omaha and submerged near erie, pennsylvania. Baseballsize hail cracking windshields in northeastern missouri, and this morning folks in bellevue, nebraska, still cleaning up after two tornadoes raged across that town. South of omaha. This drone footage showing a street leveled. Roofs lifted from their structure, wooden beams scattered across yards. Weve already had a considerable amount of moisture so you add these strong storms, 1 to 3 inches and flash flood watches that stretch from parts of virginia up to maine. Those are in place mostly for the storms later this afternoon and through the evening hours so drive time, you could see damaging wind anywhere from albany there back to places and even north carolina, but certainly into virginia. Robin, if this is not enough we have Tropical Storms and track those in a couple of moments. All right, ginger, thank you. Were also following a lot of Major Political headlines this morning. A lot of eyes are on a special election in georgia tomorrow. The most expensive house race ever. And the senate is getting ready for a major push on health care. Majority leader Mitch Mcconnell says he wants to pass a bill before the july 4th recess. Also this week, the president s soninlaw, Jared Kushner, is heading to the middle east to try and force a peace deal between the israelis and palestinians. This, as President Trump faces new questions over whether hes being investigated for possible obstruction of justice. Our senior White House Correspondent is here with us, cecilia vega has the latest. Good morning, cecilia. Reporter good to see you here this morning. You remember that tweet, of course, that caused such an uproar. The president for the first time seemed to confirm that he personally is under investigation. Well, now, his team is doing some damage control saying he is not under investigation. A weekend away at camp david, President Trump is now back at the white house and once again under fire. After he sent this tweet saying he is being investigated, now his legal team is making the rounds with this contradiction. The president has not been and is not under investigation. Let me be clear the president is not under investigation. Reporter but the attempts to correct the record leading to more confusion. And now hes being investigated by the department of justice, so hes being investigated for taking the action that the attorney general Deputy Attorney general recommended him to take by the agency who recommended the termination. Youve now said that he is being investigated after saying that no. You just said no, hes not being investigated so i do not appreciate you putting words in my mouth when ive been Crystal Clear that the president is not and has not been under investigation. I dont think i could be any clearer than that. Well, you dont know that hes not under investigation, again, sir i cannot read youre right, chris, i cant read the mind of the special prosecutor. So were in agreement. So were in agreement. Reporter now even some republicans jumping in to defend the man leading the investigation, special counsel robert mueller, senator marco rubio telling the president let mueller do his job. The best thing that could happen for the president and the country is a full and credible investigation. Reporter and on this one, democrats in agreement. We ought to let him do his job. He is just Getting Started. Reporter and there is another big deadline looming this week. The House Intelligence Committee gave the administration until friday to hand over any evidence of white house recordings if, in fact, they do exist. A lawyer for the President Trump says he plans to make this announcement this week about the tapes but the same lawyer said the same thing last week. When it comes to the investigation once again, it seems like the white house is sending out these mixed messages. Completely mixed messages. And in the end the lawyer ended up conceding that he had not heard factually or directly whether the president is actually under investigation. But once again, just like with this issue with the tapes and of the investigation this is an example of President Trump getting ahead, contradicting his team on twitter, really going off script from the white house messaging, and hes causing a lot would say problems for himself with this. And thats why were left with this. Depending on which sunday show you were watching you got a different answer. Cecilia, thanks. Were going to turn to more on that high stakes special election in georgia, the most expensive house race ever being so closely watched by both sides of the aisle and mary bruce tracking the race from capitol hill. Good morning, mary. Reporter good morning, david. Well, this is a defining test for both parties and this morning it is still too close to call. This is a solidly republican district that trump barely won by just one point and now democrats are hoping if they can win it will serve as a referendum on the president betting on 30yearold newcomer jon ossoff and betting pretty big. He has pulled in more than 23 million, the most expensive house race ever, going up against karen handel vying for those Republican Voters who may be uneasy with the president. If she wins this will be a demoralizing blow to democrats who are going to have to rethink their entire strategy heading into the midterms. Tough fight but now both campaigns are speaking out against an ad thats particularly offensive and we wanted to show people at home what it was all about. Now the unhinged left is endorsing and applauding shooting republicans. When will it stop . It wont if jon ossoff wins on tuesday. Trying to connect or link the democrat, jon ossoff, to the shootings last week in washington, mary. Reporter yeah, and, david, both candidates this morning are blasting this ad. Jon ossoff is saying it is disgraceful and hes calling on his opponent to denounce the ad and asked it be pulled down. Now, karen handel stopped short of that but calling is disgraceful and disgusting. The democrat ossoff hasnt mentioned President Trump in his campaigning. How concerned is the white house about how close this race is with the republican . Reporter yeah, david, no question they are going to be paying very close attention to this. This race will be an indication of how the president and his agenda is resonating with voters, especially moderate republicans. Well be keeping a close eye as voters head to the polls tomorrow. Mary bruce, thanks. To amy with a really unfortunate story. We had a similar case in the u. S. , a muslim teen leaving a mosque. Now an arrest has been made in the murder of a 17yearold girl who was leaving a virginia mosque. Nabra hassanen walking with friends when police say she got into some sort of dispute with a man in a vehicle. Police say 22yearold Darwin Torres attacked her with a baseball bat. Her body was later found in a pond. Overseas dramatic images from portugal where thousands of firefighters are trying to contain historic forest fires blamed for at least 62 deaths. Many were burned in their cars while trying to escape down a road thats now being called death highway. And authorities in london have raised the death toll following that massive fire in a highrise apartment building, 79 people are now confirmed dead as the recovery operation continues there. British Officials Say the exterior siding may have been illegal. And there is some encouraging news about congressman steve scalise. His condition was upgraded from critical to serious over the weekend following last weeks park shooting. Doctors say he is more responsive and his twitter account included a fathers day message saying steves greatest joy is being a father. And finally, how young is too young to own a smartphone . A proposed ballot measure in colorado would ban the sale of smartphones for use by anyone under the age of 13. Violators would face a 500 fine, supporters need to collect about 300,000 signatures to get the ban on the ballot. The guy who is proposing this is the founder of paus, parents against underage smartphones. What do you think . That might be a tough sell. I like that. I want him to come over and try to take my kids phones away. And now the big surprise at the u. S. Open Golf Tournament this weekend, the winner, brooks koepka, well, he shot a record tying 16 under. That is what you call hot. It was his first major ever, first major win ever, and hes taking the trophy and hes going to give it to his dad bob for fathers day. He said i didnt get him a card so i really hope this works. Im sure dad will be happy. Thats the seventh consecutive major won by a firsttimer. I love that. Makes it so much more exciting. Great for the game of golf. It is. Lets go back to ginger watching those two systems developing in the tropics. Were in Hurricane Season officially so it makes sense we see two areas of thunderstorms. This one here east of the yucatan peninsula has a good shot of becoming a Tropical Storm even later today. How much it interacts with that land mass of the yucatan tells us where its going to go. Southwest to houston is a longerterm model. A lot of it would be