PROVIDENCE, R.I. (AP) — Authorities have asked the public for any footage they might have of the gunman who fatally shot two students and wounded nine others at Brown University, even as they released a new video timeline and a slightly clearer image of a possible suspect.

Investigators provided no indication Tuesday that they were any closer to zeroing in on his identity. In all the videos made public, the suspect’s face was masked or turned away, and authorities have only been able to give a vague description of him as being stocky and about 5 feet, 8 inches tall.

Officers have been canvassing around Providence in search of clues that might help them figure out who was behind Saturday’s campus shooting.

Surveillance video the FBI posted online before it was removed showed a person in dark clothing walking along multiple sidewalks for about an hour starting shortly after 2 p.m. Saturday. The streets were all within a few blocks of the Brown University engineering building where the shooting occurred.

Some clips show the person walking in front of properties several times. In one, the person abruptly turns around and runs in the other direction when someone approaches.

Two clips taken minutes after the shooting show the person walking away from a parking lot and then along a street.

Police have received about 200 tips, and Col. Oscar Perez, the Providence police chief, asked the public on Tuesday to look at their camera systems in the area to see if they have footage that might help officials identify the suspected gunman.