We are following two breaking stories. Startling new revelations about the terror attack in texas. The head of the fbi telling cnn his agency not only sent out a warning that simpson was interested in the gathering near dallas the fbi agents were waiting at a command post when the attack came. We have more on the Terror Threat thats coming up. Lets begin with another major breaking story right now. Polls are closing right now across the United Kingdom in what analysts are calling the most unpredictable British Election in decades. Results are crucial to the United States. The Prime Minister has been obamas top partner in the war on terror and the battle against isis. Our correspondents and experts are standing by to bring you coverage of the breaking news. Lets begin with nic robertson. He is standing by in london where the polls have just closed. Nick . Nic . Reporter the doors closed. They have been open for 15 hours. The understanding is that the turnout has been higher than we have seen in previous elections. Were beginning to get the first exit polls, the first, if you will estimation of the way this vote is going to go. Remember there are 650 seats in the parliament. No party was expected to get a simple majority. The magic number is 323, because five from Northern Island dont take take up the seats. Who will form the new government needs 323 seats in a coalition. These are the numbers we are getting on the first exit poll. David come ran 316. Labor party with 239. The liberal democrats who David Cameron is in government with they have ten. That means cameron and his partners would have 326 seats, which means they would be most likely to form the next government. However, i have to add into the figures, these are exit polls. They are estimations put together by experts who study the elections. These are not the results. The real numbers wont become apparent and we wont know about them for about another four or five or six hours. The first result perhaps in the next 40 minutes or so. But to get a bigger more realistic picture, thats going to take many, many more hours of counting. Stand by. I want to check in with Richard Quest, who is also in london for us. Where are you, richard . Whats going on over there . We are with the election band on the bigredbus. Its a double decker bus. There is the houses of parliament behind us. Were traveling around the british capital. Were bringing the views, the mood as the british capital comes to terms with what sounds like an outstandingly result very unexpected. If its true, the exit poll tonight. All night, the big red bus will make its way around london. Basically, what these exit polls show we want to stress to our viewers here in the United States and around the world, these are just exit polls. The real numbers could be different. If they hold it looks like David Cameron will be able assuming can he get the minority party, the liberal democrats, he would remain as Prime Minister. What does that mean as far as u. S. British relations are concerned . For u. S. British relations, it would mean very little change. Especially as the u. S. Heads toward a president ial election. David cameron and obama have been tide at the hip on so many policies. The fear in washington as we discussed last night, wolf was that a miliband victory could jeopardize that. If cameron gets the result that it looks like tonight, there will be relief i guess, in winfield house where the u. S. Ambassador lives and certainly in foggy bottom in the state department they will be somewhat relieved that theres no change in london tonight. As far as britain remaining in European Union, what would be the impact if cameron stays in power . Now, im glad you reminded me. In the excitement of the poll i forgot about that. Thats the big story tonight. I managed to lose it somewhere along the way. There will be a referendum in the United Kingdom if the exit poll is right, if its right, there will be a referendum in the United Kingdom on staying in the European Union by the end of 2017. David cameron made that a firm election pledge this election. So there will be a renegotiation. The result of which will be a referendum. Washington has mixed views on that as are well aware. Tonight, i think many european leaders, merkel many leaders in europe will be dismayed because they know britain is about to become a very troublesome member of the eu. What about scotland . That was a big issue in this election as well. Scotland, absolutely. The good numbers from scotland. The s p 500 should be about yes . They have all the seats in scotland. The s p 500is a big force in the building. They are hugely important now. The question is since cameron may be back in power, will they be able to get another referendum on Scottish Independence . Very unlikely baring in mind cameron doesnt need them or particularly like them and he can govern without them. It shows the Scottish National party would get 58. These are exit polls. These are not the actual numbers. Richard, stand by. Todays vote across the United Kingdom could have an impact on security here in the United States. Tom foreman is taking a closer look at whats at stake. What are you seeing . Reporter look at the numbers. I dont have a band like richard. But we have the numbers here that we have been talking about. Conservatives up here 316 right now is what we are looking at. Labor, 239. Liberal democrats here with ten. If you throw in the scottish group, thats 58. These are really the numbers everybody is interested in. Conservatives here and liberal democrats here. Because of what is at stake. If you look at what David Cameron has been talking about here we consider this idea what were talking about is this question of possibly leaving the eu. That would be on the table if this is happening. Thats a potentially big thing in the u. S. We keep saying it will be unchanged. Its not necessarily unchanged, because if that happens then you have questions about trading partners how they react to it and whether or not this becomes a hiccup in the worldwide economic recovery which could affect everyone including the United States. Thats why we care about this so much. Obviously, the labor concern over here was a different question. With labor, it had to do with military support in large mesh whether they would fight against isis with russia. If this is openff the table and were back here looking at this equation with David Cameron things are not exactly going to stay the same. They will just be one of the more similar outcomes something people could bank on compared to the past without seeing gigantic enormous changes heading into the future. Thats why washington may be excited about the exit polls if they hold true as richard pointed out and nic as well. Its a big if. These are exit polls. The real numbers should come in over the next few hours. Lets get more now on the impact of todays elections. Joining us are jim sciutto, Richard Quest is with us as well. He is aboard the big red bus in london for us. Jim, i know you are speaking to a lot of u. S. Officials. They are watching whats going on with one of americas closest allies in britain. What are you hearing . Reporter i spent ten years in the u. K. The big question from the American Perspective is does this make the special relationship less special . The truth is whoever won, it would be so. You have a real pressure within this conservative party for to have this referendum to leave the eu. Without the u. K. Its bad for america. They are weaker. The eu is americas biggest trading partner. Enormous when you talk about russia, ukraine and the u. K. The closest military partner. When they are separated, thats a less Strong Partner for the u. S. Overseas. Even though the cameron government he has been under budget austerity. He has cut weapons programs which makes britain not as close of a military ally for the u. S. Their troops are out of afghanistan. Theyre out of iraq. Their aircraft carriers dont have aircraft capable up to date to landing and taking off. Thats a big decrease in their ability to support us militarily. On the labor side if they were to win and put something together thats more inward looking. Questions about the nuclear due deterrent. For both sides, its not moving in a great direction. If the conservatives hold true as it shows here thats a better result of two lesser results from the u. S. Perspective. One thing to keep in mind theres less pressure for the conservative party to come out of the eu when that u. K. Independent party which americans may not have heard of. Its very right wing. Its very antiimmigrant. Its antieu. They got two seats. Thats a big result. Virtually no seats at all. Let me go back to Richard Quest, aboard the big red bus driving around london for us. Give us a little flavor of how this has been going on, richard, behind the scenes. We know go ahead. Right. I want to say, were about to pass 10 downing street. Coming up this is what this is all about. The man who is going to move into number 10. Were giving you a real tour of london no extra cost. There is downing street. Thats where the Prime Minister lives. And thats where we think if the exit poll is right, david come ran will comecameron will be returning. Tell me the exit poll. This would be a phenomenal result for David Cameron. He is up on his seats. Theres an almost wipeout of labour. Is there any this is one of the leading political observes. Quick question. Is there any way on the exit poll is there any way labour does it . Absolutely not. It does not add up to 300. David cameron is on 316. There you have it. Putting this into perspective, lets pull the strands together. One of two things happens tonight. The exit poll is wrong. In which case thats a mammoth story. We find out who won. Or the exit poll is right and David Cameron is back in number 10. Whichever way you look at it wolf political tremors have been have lapped here edhappened here in london. Having a good time in london as he always does. Thank you very much. Once again, it looks like if you believe the exit polls, David Cameron will be reelected will be the Prime Minister. We will stay on top of the story, get the real numbers. Theres other Important News were following as well. Including a stunning new revelation that the fbi actually gave local Law Enforcement a heads up before the terror attack in texas. Even as it warns that there are other potential attackers at large right now in the United States. Isis is on verge of a major victory. 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Its really nice mom. Your dad wouldve loved this place. Youre not just looking for a house. Youre looking for a place for your life to happen. Zillow breaking news. A new revelation about the terror attack in texas in which two gunmen were killed as they targeted a mohammed event. The fbi was zeroed in on one of the gunmen. Now we are learning the fbi sent out a warning shortly before the attack. He haven n evan perez is here. What did the fbi director tell you about what the fbi knew . The fbi in march opened a new investigation on simpson, one of the two gunmen who made this attack in garland, texas. This is a warning that a generalized warning they sent to the Garland Police. It didnt have any specific information, per se. It only said that he had expressed interest in some of the social media activities about this mohammed cartoon contest event. The fbi did not know he was planning to attack. They did not know he was actually on route to garland, texas. So the fbi is careful to say the Police Department did not have any indications this guy was on his way. But he was among a list of people that the fbi was keeping an eye on. They knew that this event was drawing a lot of controversy. He had an ominous warning about future attacks similar to this maybe even worse. Absolutely. He said that the way isis recruitment is changing online he is saying that its getting harder and harder to figure out who is going to move from just being talked to online and communication with isis recruiters and actually carrying out an attack. What he said was, there are more there are other he willsimpsons out there. He knows it. He is monitoring investigations around the country and its harder every day to find these people. He is a serious guy, the fbi director. When he speaks like that its serious intelligence serious information. Thanks very much. Were learning that the texas gunmen may have been more closely connected to isis than anyone imagined. Also had a link to another terror group. All this coming as lawmakers are briefed on the long arm of isis hearing new details about how it reaches deep into america through social media, influencing and instigating sympathizers. Lets bring back jim sciutto. He has more. Reporter this case shows that the net designed to catch lone wolf attackers have gaps that have to be filled. The u. S. Opened an investigation of simpson and put him under monitoring and knew he was interested in the texas event and yet he got through. The f directbi director saying he is sure there are other simpsons out there. An alarming video showing the gunman explaining the attraction of his conversion to itslam. Provide weaponry to go out into the real world and use that weaponry. Reporter simpson had deeper ties to terror groups like isis than officials previously knew. Including direct private communication with this wellknown britishborn isis recruiter, hussein, currently thought to be in syria. And this american hassan believes to be in somalia. Investigators now suspect that the isis and al shabab members had a more direct role in sundays shooting pushing simpson to carry out an attack. There is no evidence yet that the men had operational control, such as choosing the texas target or the timing. Today on capitol hill lawmakers heard the latest on isis reach to the u. S. Homeland through social media. Our authority can follow the open source social media. The minute those individuals who are really serious about it go offline, we go dark. Reporter the texas shooting raises hard questions about how many other potential isis recruits are lying in wait and communicating overseas. This week isis claimed it had 71 trained soldiers in 15 states. Senior Administration Official called the claim propaganda saying its isolated. A recent study has found that 62 people in 19 states have attempted to join the terror group. The only profile that the group share are 53 of the 62 individuals were active on social media, downloads and sharing jihadist propaganda and communicating with members of isis in syria. Reporter the texas shooting is refocusing attention from returning fighters to recruits here on the ground in the u. S. The fbi director saying there are hundreds of investigations in the u. S. Of possible extremists influenced by known isis recruiters. They are using peer to peer applications. These are difficult, impossible for Law Enforcement to track. One more thing, we talked about how postedward snowden, that terrorists in the field and at home are changing the way they communicate. They now hotw the fbi and others are tracking them. Thanks for that report. Now more from james langford. Thanks for joining us. The fbi director says he tell tells evan perez that they issued a warning about simpson, that he was interested in this very controversial event going on. But they didnt know simpson was actually traveling to texas. Is that some sort of failure . What was going on . Its not. You have a lot of people that may express an interest that may use the word jihad. Just because someone says something, anyone who uses social media will know how many different conversations are going on. He had a criminal record. He had been convicted of lying about some alleged terror connection if you will. He got probation. He wasnt sentenced to jail. He did get three years probation. Should he they should have been watching him more closely . I dont think so. He hadnt shown any tendencies. You realize, there are a lot of these conversations that happen through social media. The challenge now is to filter through and find out whats legitimate what someone is bragging someone thats basically mentally off, they are making wild statements or what is serious. Thats our Intelligence Community has to filter it quickly. What was ominous is to hear what the