And nursing home deaths, the home where eight patients died in the wake of Hurricane Irma giving their side of the story. Their calls for help after losing power after more fingerpointing. Who really dropped the ball here as fears grow over stubborn hurricane jose out there in the atlantic. Our weather team tracking its path right here this morning. Hey, good morning, everybody. Lets get straight to the breaking news. Police in the uk say theyve arrested an 18yearold man in connection with the london subway blast that injured more than a dozen people on friday. Now, despite this arrest, the country is on edge this morning. Hundreds of soldiers are deployed in the streets. Authorities say the Terror Threat level will remain at critical, meaning they believe that another attack might be imminent. The crude bomb used here was contained in a bucket, wires hanging out of it. It partially exploded during the morning rush hour. The blast set off a stampede of terrified commuters. Now, isis has claimed responsibility. They say more bombs are out there. Questions loom this morning including whether there are other terrorists on the loose right now. We begin our coverage with abcs ian pannell, who is in london for us this morning. Ian, good morning to you. Reporter dan, paula, good morning to you from Parsons Green station. This was the station that was attacked yesterday. You can see the police out on patrol this morning. Things remain tense here, and people are being vigilant, so, yes, some major news. An 18yearold man picked up in the southern port city of gopher. Why is dover important . If youre trying to flee the country, dover is one of those places you go to. You get on way ferry and go to france and youll be in continental europe. Two other things to bring viewers up to speed on. One is that this investigation is continuing and that the Terror Threat remains critical. This morning as london recovers from the terror attack, a major police breakthrough. An 18yearold arrested in southern port city of dover. But the investigation continues, and theres a heavy Police Presence at busy london train stations. The uk Terror Threat raised to critical overnight, the highest possible tier meaning another attack could be imminent. Counterterrorism police and mi5 hunting for other suspects. The homemade explosive detonating at 8 20 a. M. Yesterday morning, but it didnt go off as the attackers planned. Within three seconds of putting the bag down the doors closing and a loud explosion occurred. I turned left, and i saw the fireball to my side. Reporter people desperately trying to escape. There were women underneath me. A lady saying im pregnant. A little boy, his face got smacked. There were just layers and layers of people screaming. People were just getting crushed, and we were just trampling each other, and it was just every man for themselves. Reporter Emergency Responders tending to the injured after passengers escaped out the back of the train. I saw one woman being wheeled out on a stretcher, her legs were quite badly burned and all wrapped in plastic and her hairline looked quite charred. Reporter police saying many could have died in the bomb had fully exploded. We understand it was the same material in the Manchester Ariana grande concert, tapt known as the mother of satan, but it seems the bombers got the mixture wrong, which is why it did go off as planned. Were strengthening our policing reforces on the streets of london and around the country. Reporter isis say they planted the bomb that left 30 injured. The fifth terror attack in britain this year and more than that have been foiled by the police. Well, what that means is that britain is facing its most sustained terror attack incident since the 1970s in the i. R. A. Bombing campaign. But this isnt a country, this isnt a city that scares easily, and i dont know if you can see, this is a normal saturday morning, a little market. There are people out with their do dolls, with their children. Even so, people are remaining vigilant and cautious and theyre on high alert. Dan, paula. They are on high alert but britain is a country of resiliency. Ian, thanks for your reporting. From london diane this morning. We want to bring in abc news contributor john cohen who was a top intelligence and counterterrorism official in the department of homeland security. Good morning to you. Thanks for joining us, john. First and foremost, as ian was just reporting, this 18yearold was arrested. How significant a development is this arrest, and how does it change the investigation . Well, its a significant event. It will help lead authorities to determining whether there are additional attackers who are out there. Thats their number one priority at this point. They want to find out whether this person worked alone or whether there are other people out there who may be preparing to carry out an attack. Secondly, theyll want to figure out, was this somebody who was recruited and trained by isis or al qaeda, or was this somebody who was a troubled youth who was inspired by what they saw on the internet. As ian pannell reported, fridays attack may have involved the same type of explosives used in the bombing of that Ariana Grande concert in manchester several months ago. What do you make of that connection . Is that important . Well, it could be very important. I mean, what Law Enforcement authorities in europe and in london in particular will want to determine is whether they have a bombmaker out there who is working with multiple groups of people to set these bombs and try to cause these attacks to take place. So that will be one of the things that theyll look at. The good news here is that much of the bomb still exists, so theyre going to be able to get a lot of evidence from that device, which will help them lead to the bombmaker. John cohen, thank you very much. And we want to say that coming up in the next hour, an abc news exclusive. Our senior justice correspondent Pierre Thomas is going to take a look at how the fbi trains Law Enforcement officials to investigate similar bombings and the forensics they use to analyze the aftermath of an explosion. And we want to move to politics now. Meantime, President Trump is taking heat over what he tweeted about the london terror attack. The president getting a rebuke from the british Prime Minister about making what may be unsupported statements in the middle of a terror investigation. Abcs Gloria Riviera is in somerset, new jersey, near where the president is staying this weekend ahead of the upcoming United NationsGeneral Assembly meeting in new york city. Gloria, good morning to you. Reporter good morning, dan. Thats right, and this is not the first time President Trump has touched a nerve in his criticism of how the uk handles these terror incidents or intelligence issues, and this time british officials are calling his comments extremely unhelpful. Our hearts and prayers go out to the people of london who suffered a vicious terrorist attack. Reporter President Trump offering sympathy for the victims of londons latest terror attack as britains Prime Minister scolded the president for his initial reaction on twitter. Another attack in london by a loser terrorist. These are sick and demented people who were in the sights of Scotland Yard. Must be proactive. Our George Stephanopoulos sat down with Prime Minister theresa may in the hours following the attack. President trump was up and tweeting this morning. He said that those behind the attack were in the sights of Scotland Yard. Is that true . Well, i dont think its helpful for anyone to speculate on what is an ongoing investigation. Reporter in washington the president s team backpedaling attempting to explain what the president meant. Obviously all of our Law Enforcement efforts are focused on this terrorist threat, so i think if there was a terrorist attack here, god forbid, that we would say they were in the sights of the fbi, so i think he didnt mean anything beyond that. Reporter but the president was clear in reviving his call for a tougher travel ban on some majority muslim countries in the wake of the attack. The travel ban into the United States should be far larger, tougher and more specific, but stupidly that would not be politically correct. I think what is important is that were able to have the powers to identify people who may be wanting to cause us harm and are plotting to cause us harm. Reporter the u. S. Embassy in london is warning americans traveling to the uk or already in the country that as ian mentioned that threat level remains high, and they should review their personal security plans. Dan, paula. Gloria riviera reporting in from new jersey. Gloria, thank you. And you can see much more of georges interview with the british Prime Minister theresa may sunday morning on this week right here on abc. It is time for some expert analysis. Joining us now from washington is abc news political commentator cokie roberts. Cokie, good saturday morning to you. Good morning to you, paula. Dan. So yet again here we are talking about a controversial tweet from President Trump. But does this one about Scotland Yard supposedly having the people who pulled off the latest terror attack, quote, in their sights, does this really have any longterm consequences . No, but what it shows is donald trump is donald trump. Weve had a week of a quiet white house with a president meeting with democratic leaders, having his cabinet to camp david, going down to the hurricane disaster areas and all of it being very president ial, and all of a sudden now we have back the tweets, and it just shows you that you cant just count on donald trump to be anything other than donald trump. And thats what those tweets were showing us. You mentioned the meeting with the democratic leaders. I want to talk about that because theres been so much talk about this agreement or what appears to be an agreement that trump may have reached with democratic leaders, Chuck Schumer and nancy pelosi, to protect the socalled d. R. E. A. M. Ers. We know that some Trump Supporters are really upset about this, but interestingly, politico posted a story overnight about how some liberals, some people on the left are also upset. So i want to ask you how much of a Political Risk is there here for chuck and nancy as trump calls them . His new best friends, chuck and nancy, who i think, by the way, he probably does get along with better than Mitch Mcconnell and paul ryan who are much more foreign to him, you know, somebody from kentucky and wisconsin as opposed to new york and san francisco. But the truth is, its always difficult to govern, and thats what pelosi and schumer are doing here. Theyre finding a way to actually protect those 700,000 to 800,000 young people who have been covered by the Deferred Action Program and people on the left and right hate that. They want to just fight, and they want to characterize the other side as the enemy and use it in political campaigns. And so the leaders of the democrats like the leaders of the republicans have to be careful of the people at their base and make sure that they are not angry, and right now in the congress, you have very few democrats who are not part of that liberal base because all of the people who were more moderate democrats for the most part have lost, and so that makes it harder for schumer and pelosi, but theyre very good at dealing with their members, and i think that if they really can get a deal to protect all those young immigrants, that that will be a feather in their caps. Cokie roberts, always a pleasure to have you on. Thank you very much. Good to be with you. Have a good saturday. Thank you. Were going to turn now, though, to another story that broke overnight. Violent protests in the streets in st. Louis after a white former Police Officer was acquitted in the shooting death of a black man. Demonstrators even targeting the mayors own home. Alex perez joins us this morning with more on the violence and what led to the arrest and what that former officer is saying about the shooting. Alex, good morning to you. Reporter good morning, paula. Most of those demonstrators remaining peaceful, but a small Group Overnight turning violent, breaking the windows here at this restaurant and even throwing bricks at Police Officers. Overnight hundreds of demonstrators taking to the streets in st. Louis. [ chanting hands up, dont shoot ] Reporter Police in riot gear equipped with mace and tear gas arresting more than 30 people. People are just fed up. This is crazy. Reporter protesters are coming out voicing their anger against the acquittal of former officer Jason Stockley charged with killing Anthony Smith. Change has to come, and it has to come now. Reporter Jason Stockley speaking out overnight. I can tell you with absolute certainty that there was no plan to murder Anthony Smith during a highspeed vehicle pursuit. Reporter that 2011 pursuit caught on camera. Stockley with his partner approaching and soon chasing after their suspect. Smiths vehicle crashing into a telephone pole. During the highspeed chase stockley can be heard saying, were killing this expletive, dont you know. Gunfire followed soon thereafter. Smith was left dead. Jason stockley later testifying he saw smith with a gun. A firearm was recovered, but prosecutors argued stockley planted that weapon. Video after the shooting shows stockley digging into a bag in the backseat of his cruiser. I did not murder Anthony Lamar smith. I did not plant a gun. Reporter Jason Stockley making it clear in the st. Louis postdispatch interview that his actions were warranted. The taking of a life is the most significant thing that one can do, and its not something that is done lightly. It was an imminent threat to my life. I had to. Reporter that explanation not sitting well with protesters. [ chanting hey, hey, ho, ho, these have got to go ] reporter the home of the mayor of st. Louis bearing the brunt of some peoples anger, bright red paint splattered across the homes exterior, windows broken by hurled rocks. Authorities say ten officers were injured in the protest. Two of them so seriously, they had to be hospitalized. Dan, paula. Quite a scene outside the mayors home. Alex, thanks for your reporting from st. Louis this morning. We want to move to florida where a nursing home that saw eight residents die following Hurricane Irma now speaking out about the number of calls that it made to the Power Company as concerns intensify about who may have dropped the ball. So many questions there. Also this morning, the daughter of two people who lived in that nursing home and who ended up in the hospital, shes now sharing video she says was shot hours before her parents were rushed in for that medical care, and abcs eva pilgrim is right there in hollywood, florida, with the story. Eva, good morning to you. Reporter good morning. This morning a lot of fingerpointing and a lot of questions as to how so many people could die inside this facility, their deaths blamed on the heat when a hospital with power is literally within eyeshot of here almost right next door. This morning the florida nursing home at the center of a criminal investigation speaking out amid outrage after eight people died when Hurricane Irma shut down the power. Patients sweltering in the heat. Owners of Hollywood HillsRehabilitation Center saying they called Florida Power light on sunday but repair crews never showed up even though they spoke with the Utility Company four more times. The owners say they even dialed state agencies including the Governors Office. The governors spokesperson confirms those calls to an Office Emergency cell phone but insists at no time did the facility report that conditions had become dangerous or that the health and safety of their patients was at risk. I can see my fathers face when i see it. Reporter a Family Member recording video of roys 89yearold parents inside the facility tuesday, hours before frantic 911 calls that residents were dying. You can see a fan being used in the background. She says her parents are now recovering. But shes reported issues with the nursing home before. With the air condition, mold at the ceiling. But i always take a picture and i go immediately to the administrator. Reporter she says the facility didnt do enough. With so many nurse in there, i dont know how this happened. Reporter now the Power Company says while the facility was a priority, it wasnt the highest priority. That went to 911 call centers and hospitals. Both the Power Company and the Governors Office say they told the facility if it became an emergency, to call 911, guys. S