just on the other side of this crime tape 100 yards down to the right of those white cars is an permit police say was presented by the two shooters. not clear if they live there or if they use it as some sort of workshop. authorities are saying the apartment is critical to their investigation while they are figuring out the motive. most critical are the things found there, computers, flash drive, cell phones. they will be taken by the fbi to the lab to be analyzed carefully. not only to answer the question about motive but perhaps whether anyone was associated with them directly or in terms of inspiring violent acts. agents have been going through a car outside. we have seen agents going in and out of the apartment all day. they were analyzing a car.