Denver's Police Chief Gerald Whitman agreed that law enforcement, through Colorado's intelligence and fusion centers, worked well together in the investigation that led to the arrest of terror suspect Zazi. However, Whitman says he hopes more tips in the future come from residents. "We need the tips from the community. We really do need those. Even though sometimes they may be burdensome, when they come in large numbers when we're in a heightened state of awareness after an arrest like this, but I guarantee we're going to follow up on each one of them and follow up to see if there's a connection to anything," Whitman said.

I think most people know what to look for. The problem is that they ultimately don't trust you enough to expose themselves unless they are really, REALLY sure ...