. >> reporter: again to reteat pete the fbi is taking over -- to repeat the fbi is taking over the lead in this investigation. they go through each piece of possible evidence. we have information the atf is also involved looking for the explosive devices to learn more. police are receiving a number of tips but will not elaborate. if we have updates on the investigation we will bring them to you in the next 30 minutes. live, eric rasmussen, ktvu channel 2 news. >> there are hundreds of runners in boston for the marathon. ktvu's noelle walker is live where many runners are waiting for word that their friends are okay. >> reporter: a lot of those people trained on trails like these. i talked to a friend of mine who ran a boston marathon today, he said he is okay. he crossed the finish line and was back to where he was staying when he heard the explosion. an hour ago i spoke with a runner who told me she was in the vicinity at the time, she said a lot of people had no clue what was going on because it was a party atmosphere, she said there was a lot of confusion. >> do you need help? >> rep