Beloit police are investigating a pair of armed robberies Friday night. One occurred around 10:30 p.m. at a home in the 1200 block of Bluff Street. Two suspects are in custody, and a BB gun, which police say resembles an assault rifle, was recovered. The other armed robbery was on the street in the 1700 block of Wisconsin Avenue. Police are pursuing a lead on a suspect they say displayed a hand-gun. No one was reported injured,.