Providence (AFP) — A gunman remained at large Monday after a weekend mass shooting at elite Brown University left two dead and nine wounded, with United States authorities releasing new footage of a masked “person of interest” captured on surveillance cameras.

The shooting took place Saturday in a building where exams were underway on the Ivy League campus in Providence, Rhode Island when a man with a rifle burst in and opened fire before fleeing.

Authorities initially detained a man in connection with the shooting, but they later released him, saying he was unconnected.

Police revealed at a Monday briefing newly acquired security camera footage of another person wanted in connection with the shooting, wearing a dark beanie hat and a mask along with a heavy black coat.

The two students killed were Ella Cook, vice president of Brown’s Republican association, and Mukhammad Aziz Umurzokov, originally from Uzbekistan, who had hoped to become a neurosurgeon.

“We want to see the individual that pulled the trigger on these young kids identified, apprehended and brought the justice,” Rhode Island Governor Dan McKee told the briefing Monday as the perpetrator remained at large.

Local police earlier said that officers had “an enhanced presence in Providence neighborhoods” and that they were going door to door requesting surveillance camera footage.

“This is a very active investigation, very complex investigation,” Providence chief of police Oscar Perez said at the update.

The FBI as well as agents from the US Department of Homeland Security were involved in tracking down the shooter, he added.