Beloit police are investigating a pair of shots fired incidents Friday night.  Police were called to the 200 block of Adams Street about 9:00 p.m. for a report of several shots fired.  Officers say witnesses reported seeing a white Suburban and dark colored Gran Prix, with a light colored bumper, speeding away.  Several shell casing were recovered.  The second call came in less than an hour later from the 1800 block of Shore Drive.  Police say three shots were reported, and a green sedan was seen leaving.  No one reported hurt in either incident.