. >> a resource center has been opened in castle park pla sa to help runners. if you want to get a sense of the chaos that followed the bombings, listen to the radio communications of police, firefighters and paramedics. >> this is 84, take control i need lanes open here. >> 901 we have another -- we need to get people away from it. >> clear everybody out of there, use caution there may be possible additional devices. all officers monitoring use caution. >> i need someone up there to get on social media and let people know we are sweeping the streets and we have all the victims off the scene. >> you may have heard someone reference a possible explosion at the jfk library miles away. we later found out that fire had nothing to do with these bombings. >> this morning we are hearing from local runners. one of those runners is a hero. a doctor in that group performed cpr on a runner. they say boston looked like a war zone. >> i said this can't be a bomb. >> i have seen something like that. and when the second bomb went off, we knee this was for real. >> more than 1