This is an unusual story. A Rosemont police sergeant has been arrested in connection to two armed robberies at suburban gas stations earlier this week. Authorities said Edward Karas, 40, and Wright O'Laughlin, 48, robbed the Shell gas station at 2301 W. Touhy Ave. in Park Ridge about 6 a.m. Wednesday. In that incident, a masked man displayed a silver handgun, stole about $100 and left in a car waiting around the corner. An hour later and four miles away, the duo robbed the Exxon gas station at 8500 W. Lawrence Ave. in Norridge, according to authorities. The suspects and their vehicle were caught on camera.