OMAHA, Neb. (AP) — Omaha police say they believe the same man could be responsible for three armed robberies in the past month.

Authorities said Tuesday the suspect has not been identified and is still at large. The suspect is believed responsible for a robbery Jan. 17 and two others Dec. 20.

Police say in each robbery, the suspect brandished a hand gun, demanded money and fled. All robberies took place between 8 p.m. and 10 p.m. at convenience stores.

Police spokesman James Shade says investigation continues as detectives work to identify the suspect.