Providence mayor and police chief discuss search for Brown University gunman

We are joined tonight here on Top Story by the mayor of Providence, Rhode Island, Brett Smiley, and Providence Chief of Police, Colonel Oscar Perez. I thank you both for joining the broadcast. I know you guys are both incredibly busy trying to find this killer. Colonel Perez, I'm going to start with you. This investigation now topping about 50 hours, but up until a few hours ago, we just had one image of a person of interest. Why is this investigation taking so long, and why is it so difficult for your brav ...