The gunman who killed two Brown University students remained at large on Wednesday, and there was no indication that authorities have grown closer to identifying the suspect four days after he opened fire inside a classroom and escaped into the surrounding streets in Providence, Rhode Island. It is rare but not unprecedented for the perpetrator of a high-profile attack to evade capture for multiple days. But the lack of any identification has left people in the area on edge, with some staying behind locked doors and keeping their kids home from school.

"This is outside of the norm," said Felipe Rodriguez, a former New York Police detective who now teaches at the City University of New York's John Jay College of Criminal Justice. "Mass shooters, by large, are usually killed at the scene or quickly captured."

Investigators have released security camera images of a masked man they believe to be the suspect, based on witness accounts from survivors, but admit they still do not know who he is or what his motive may have been.

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