Pluckling screaming in pain. Fellow players in tear. Medical help slow to arrive. Carryed off the court almost 20 minutes later. What went wrong . Blockbuster buzz. This summers big money movies are packing theaters. Could the box office grab oscar glory for the first time from spiderman homecoming to planet of the apes to wonder woman. Could one of these superheroes win oscar gold . Youll soon find out. And good morning, america. So much breaking news overnight. This morning wall eyes on that g20 summit in germany. Those protesters on the streets of hamburg. Thats a look at them right now. Peaceful there but did get violent through the night. The first lady, Melania Trump could not leave her hotel because of the violence in the streets. And there are pictures of the World Leaders gathered. Theres President Trump and Angela Merkel of germany. President trump the only leader there who has not signed on to the paris climate accord. That will be on the agenda this morning. But todays key meeting, President Trump, Vladimir Putin facetoface for the first time, that was the handshake this morning with Angela Merkel and putin. The president will be oneonone on him in just a few hours and all this comes after a night of violent protests around the summit there. Thousands in the streets. Fires, tear gas and Water Cannons. Abcs James Longman is on the scene in hamburg, good morning, james. Reporter good morning, george. Im at the Police Perimeter that surrounds the g20 summit and small protests like these have been happening all morning but follow a violent evening. Overnight, 8,000 protesters gathered. Most peaceful but many intent on violence. Setting cars on fire, police using high pressured Water Cannons to keep them back. Watch as police in riot gear move in on the firefilled streets. This porsche car dealership looted. Tear gas striking the crowds. Welcome 2 hell. Thats the name of the protest gripping the streets of hamburg this morning. Protesters and authorities clashing. Bottles and rocks thrown. Over 70 police injured. Violence. I kind of feel pressure. Reporter protests always target g20 meetings but this year the stakes are higher than ever before as President Trump comes to town. This is one of the main routes where leaders are arriving for the g20 summit and protesters are trying to block it and the police, water truck, theyre trying to move people on. Up to 100,000 protesters are expected. 20,000 Police Officers dispatched. Major protests are expected to continue into the weekend and if last night was anything to go by, they could escalate. James, thanks for that. Now the facetoface between President Trump and Vladimir Putin. This meeting the first time the two leaders have met since Trump Took Office and Abcs Cecilia Vega joins us now from the site of the g20 summit. Good morning to you, cecilia. Hi. Reporter hi, amy. Theyve had a handshake and exchanged pleasantries and the white house not giving us a readout yet. The big meeting between the two takes place just a couple of hours from now. The president has been up early and tweeting all about it saying hes looking forward to that meeting and that, quote, there is much to discuss. This morning, the leaders of the most powerful countries in the world gathered together in the same room. And right there, the two men who will soon sit down for that highstakes facetoface. President trump and russias Vladimir Putin. Ahead of perhaps the most highstakes diplomatic meeting of his presidency, the president is back to tweeting about his old campaign rival. This morning going on about Hillary ClintonsCampaign Manager john podesta and the dnc email hack thanking everyone, quote, including the haters for the reviews of yesterdays speech in poland and taking a dig at the media saying, i will represent our country well and fight for its interests. Fake news media will never cover me accurately but who cares. This day of meetings with World Leaders kicking off with a handshake with germanys Angela Merkel. The white house bracing for merkel and other leaders to come down hard on the administration for pulling out of the paris climate accords. But it is all eyes on that closed door meeting with putin. Scheduled to last just 35 minutes. In poland the president offering a hint of the message he hopes to deliver. Not about moscows election meddling but rather russias role on the world stage. We urge russia to cease its destabilizing activities in ukraine and elsewhere and its support for hostile regimes including syria and iran. Reporter and this morning the kremlin says that president putin has taken note of President Trumps comments there. Now, again, in just a couple of hours the big meeting takes place. We know in this room it will be the two leaders, a small group, their translators and two top diplomats including secretary of state rex tillerson. Amy, we are also told there is no formal agenda for what theyll talk about. Cecilia, do we now how trump has been preparing for this meeting . Reporter well, we know that hes been receiving briefings in general heading into these g20 meetings and that he has a binder for all one specific binder for all of the meetings that he will have here but nothing just about Vladimir Putin. On the other hand, Vladimir Putin, as you know, amy, a former kgb operative has been studying the donald trump playbook heavily before he showed up here. All right. We will see what happen, cecilia, thank you. George. Lets talk more with our Martha Raddatz and the editor in chief of the daily beast. John avlon. Welcome to you both. No set agenda for this meeting. No specific briefing for the president. But what would constitute a successful meeting for the white house . Reporter i think a successful meeting would be they establish a good working relationship with President Trump clearly laying out the grievances the u. S. Has with russia. You heard some of those in his speech yesterday about ukraine and the support of the assad regime in syria and that putin gets the message that trump is not his friend and that he will remain tough. As for bringing up the hacking, there are certainly those who do not think the meeting will be a success unless he brings it up, george. And, john, the president , tough talk in his speech yesterday but in that press conference he seemed to take the putin line on hacking. And this is the dichotomy of donald trump, right. Scripted donald trump was very tough on russia yesterday in a very well written speech standing up for western values but in private and at press conferences he tends to freelance and fall in line with the putin line and thats going to be the real challenge. In private does he take that tough line . Is he consistent about standing up to syria . Does he bring up russian hacking or does he default to what weve heard since the campaign. We saw him freelance with the Russian Foreign minister. That talk of hacking came to the consternation of american intelligence officials. It sure did. I cant stress enough how astonishing it was to hear a president cast doubt on his own intelligence agencies. Imagine Vladimir Putin saying the same things about his own intelligence agencies while at those meetings. This just does not happen. Its humiliating for these american professionals, yes, they have made mistakes but work every day to help make the country safe and President Trump, of course, seems to believe them when he wants to. He had no problem firing those cruise missiles at syria based on intelligence, nor did he seem to have any doubts about north korea launching what his intelligence agencies told him was an icbm, george. John, on the broader agenda, the president lined up against most of the g20 issues on climb and trade. Right. Yes, and, look, thats inevitable because the president has committed to his domestic base these things that are broadly unpopular within the international community. Thats fine. Does he try to bridge it . In other ways . Does he try to keep American Leadership paramount . Right now america can pursue an America First agenda but needs to show that doesnt mean america alone and right now that confidence isnt there. He needs to be leader of the free world and assert that kind of leadership but leading from behind doesnt work if you keep avoiding these international agreements. John avlon, Martha Raddatz, thanks very much. Amy. George, now to some breaking news from overnight. Abc news learning that hackers have targeted some of the Nations Nuclear power plants, concerns this morning that another country could be involved and abcs senior justice correspondent Pierre Thomas has the latest now from washington. Good morning, pierre. Reporter amy, good morning. Fbi and Homeland Security officials have sent a warning to the Nations Nuclear power plants and other Utility Companies after a series of hacks since may. Administration officials tell abc news they targeted corporate computers of a number of companies that run Nuclear Power plants including wolf creek power plant in kansas. Wolf creek declined to comment on Security Issues to us but emphasized there has been no Operational Impact on their facility. The real concern is about the motive for these hacks, which in some cases targeted engineers would work at the facilities, the critical question this morning were they probing looking for a way in to perhaps shut down operations and sabotage these plants or threaten them and blackmail them for cash, amy . Pierre, we mentioned that u. S. Officials believe another country may be behind this. Do we know which country were talking about . Reporter sources emphasize its still early in the investigation. But Forensic Experts suspect it was a nation involved. Some offs suspect it may have originated in russia but too early for confirmation. We appreciate it. Thank you. Well move on to two scary flight disruptions. A delta flight forced to return to seattle after a passenger attacked a Flight Attendant. And a passenger making threats on a flight to cuba. Abcs aviation correspondent david kerley has that from Reagan National airport. Good morning, david. Reporter good morning, george. A very long night for these two groups of passengers and that incident you mentioned that ended in seattle became quite violent on board. Overnight, beijing bound passengers found themselves back in seattle after trouble on board. Telling cairo tv we could see the scuffles going on. One Flight Attendant said there was a code 3. Serious fight up front. Reporter just 45 minutes into the night 1 of the 207 passengers on board was walking back and forth to the bathroom in first class and then toward the exit door. Passengers also saying that a Flight Attendant tried to stop the 23yearold man and was punched. Passengers stepping in to subdue the man. They broke two bottles of wine on his head. Tried to choke him and he just threw me off like a rag doll. Approaching delta 129 with emergency. Reporter that man taken into custody. A Flight Attendant and passenger taken to the hospital with injuries that are not lifethreatening. At about the same time a canadian airliner with its own incident and an escort. You got a set of two f15s. Reporter the u. S. F15s escorting the jet back to montreal after a passenger was making threats which have not been revealed. He too taken into custody upon landing. Now, in the seattle incident that man will be in court later today. Amy, the good news is both sets of passengers now on their way to their final destinations. That is good news indeed, david. Thanks so much. Commuters here in new york bracing for delays after a train derailed at busy penn station last night. 180 passengers and crew were evacuated. Service was restored early this morning but with lingering delays and this is the third derailment at penn station this year alone. Prompting amtrak to schedule weeks of emergency track repairs, set to begin on monday. And now to that terrible injury at wimbledon. A top american player collapsing on the court and screaming this agony. Many are now asking why it took so long to get her the help she desperately needed. Abcs t. J. Holmes has more on that story. Good morning, t. J. Reporter good morning, we have seen, of course, horrific injuries in sports from time to time. We have never quite heard one like this and in a sport where crowds are told to be quiet there was one deafening one in this crowd of thousands. This young lady on the ground screaming, help me, help me. It was a hard fought duel between two tough opponents. But in a split second, it all changed. Help me. Help me please. Reporter american Bethanie Matteksands grabs her right knee screaming in pain as her challenger watches on helpless. Replays show the 32yearold charging the net with her right knee buckles and she falls to the grass in agony. Her opponent climbed over the net and catching a sight of the injured knee immediately calls for a doctor. Help me. Help me. Ive never seen anything like this and i panicked a little bit as well. Tried to comfort her as much as i could but you i mean, you could feel the pain. Reporter matteksands doubles partner lucie in tears. The tandem had been huge favorites to win their fourth straight grand slam title. The stunned crowd watched as the minnesota native was treated by a medical team. Her husband justin by her side. The player was finally carried off on a stretcher almost 20 minutes after collapsing. Felt like so long. There are sports where you see something is happening and you see it straightaway. Here it took a while so someone has to take the video and actually time and see how long it took for people to get there because for me i think she was too long on the ground. Reporter wimbledon Officials Say they responded within one minute but the player was kept on the court while pain relief was given then a waiting ambulance rushed her to a hospital. Now, she is having more tests done on that knee this morning. We might know something in a few hours. To her opponents point what if this had been a cardiac arrest where seconds matter in life and death. It took too long for somebody to get out there and could have felt like an eternity because we hear her screaming and that gives you chills about this. Were still waiting to see what happened to that knee but an awful scene. It sure was. Thanks, t. J. Move on to that latest bear scare that happened on a trail in maine when a man trained to run marathons came facetoface with two black bears. These encounters are on the rise and matt gutman has details. Good morning. Reporter hey, good morning, george. We have seen a spike in bear encounters from maine that you mentioned all the way to alaska and california where theres perfectly good luxury car got thrashed by a bear. Now, most often experts will say do not run from a bear. This marathon runner in maine didnt get the memo. He can run 26 miles in a little over two hours. But nothing could prepare marathon winner Marube Moninda for the race of his life. Against two black bears. He was six miles into his morning training run in maine when the bears emerged out of the woods. He panicked doing what runners do and sprinted towards an empty house nearby but the bears gave chase. Within seconds they were right on his heels. I was not going to fight them. Reporter he ran up to the porch, slipped inside the screened area and waited until they lost interest. Started sniffing the door. Reporter nothing but a scream betwe screen and eight bear claws. They eventually moved off. Now, running is not recommended for us mortals as i recently learned bears can reach speeds up to 30 miles an hour. You never run. Never run. You never run from a bear. Nationwide bear encounters are on the rise. With two people mauled to death in very rare backtoback attacks in alaska last month. Now that bears have shaken off their winter slumber theyre frisky looking for easy calories. Freakin bear. Get out of my garage. Reporter shamelessly invading hopes, foraging garages and raiding garbage cans. This same bear believed to be caught on another home Surveillance Video raiding the fridge. Now, i want to give you guys a sense of how powerful but how clever these bears are. This car belonged to my boss, our bureau chief. He was in upstate california when a bear helped himself into the car, opened the door, getting into the car, and then exploding it. Check this out. Completely ripping out the paneling, that was a headrest. But one of the scariest things what it did to the steering wheel. This is hard plastic it ripped right through it and perhaps adding insult to injury the bear did in the car what it normally does in the woods, guys. Yeah, yeah. And he let himself in so politely. He did but reporter the car still runs. Incredible. Reporter amazingly the car still runs. Thank you, matt. Lets go over to ginger now. A lot of Sever