Officials in Rhode Island say they are working around the clock to apprehend the man who shot and killed two students and wounded nine others at Brown University on Saturday.
Providence Mayor Brett Smiley said officers from several agencies are working on the case.
He added that students should feel safe to return to campus.
Rhode Island Governor Daniel McKee said he would like nothing more than to see an arrest.
Residents have been on edge after a "person of interest" was detained by police, only to be released soon after.
Police have released new video of the suspect, dressed in black, wearing a mask, who can be seen walking near the Ivy League School around the time of the shooting.
(Photos released by Providence Police)
1 of 2 2 of 2
