Brown University Shooting security.

The effort to find a man who walked onto Brown University’s campus and shot nearly a dozen students in a crowded lecture hall has raised serious questions about the school’s security systems and the urgency of the investigation itself. On Sunday, officials released a person of interest without charges, leaving investigators scrambling for new leads. The shooting killed two students and injured nine others. The FBI and Providence police have released footage but have not identified the suspect. Students and community members are frustrated by security gaps. The lack of campus footage has led police to seek public tips, and the investigation continues.