Two men who had been living in a halfway house have been jailed on charges they robbed nine people in six separate incidents within a couple of hours, using a BB gun that looked like a 9mm pistol.

Online court records don't list attorney for 24-year-old Keith Douglas Williams II and 42-year-old Derrick Nathaniel Bragg.

Pittsburgh police say the men robbed students from the University of Pittsburgh and Carnegie Mellon University and other residents within a couple of blocks of the supervised apartment building where they lived. The men allegedly stole cash and a purse in the string of heists that lasted from about 9 p.m. to 10:30 p.m. Sunday.

Nobody was hurt and nobody else was charged.

Officials with Residential Care Services, which runs the halfway house, say the robberies "aren't reflective" of their residents.