course. all of their next of kin must be notified before we can do that. the police chief and mayor were just speaking and they confirmed something that is important. they said it was only one shooter something that was in question. at one point authorities thought there could be up to three shooters. and jessica yellin joins me with more on that. this is something that created so much confusion and questions about how many people were involved and shooters there were. and now laying that to rest there was just the one shooter. >> that's right, erin. city officials say they are confident that aaron alexis is the sole gunman responsible for today's massacre. here's what city mayor gray had to say about that earlier today. >> we always err on the side of caution through conglomeration