Three suspects have been arrested in connection with a robbery case that put Iowa Central Community College on lockdown Monday afternoon.

Joseph Odir, 20, of Des Moines, Juma Deng, 21, of Urbandale, and Molong Deng, 22, of Des Moines, are each facing one count of aiding and abetting second-degree robbery.

A fourth suspect, Garhoth Dak, 18, of Storm Lake, was sought on a second-degree robbery charge. He turned himself in Tuesday evening, according to Fort Dodge Police Lt. Chuck Guthrie.

The arrests are the result of an investigation involving a gun on Iowa Central’s campus Monday afternoon. According to the Fort Dodge Police Department, at least one person displayed a firearm inside a dorm room on campus.

The campus was put on lockdown for about three hours Monday.