Gainesville police are searching for two sets of robbers after an incident at SunTrust Bank on Thompson Bridge Road and an incident a couple of hours later at the Marathon convenience store on Industrial Boulevard. Cpl. Joe Britte, a spokesman for the Gainesville Police Department, said the incidents are not related. Two white men in their late 40s, each weighing about 200 pounds, robbed the bank at 1430 Thompson Bridge at about 5 p.m. Tuesday, Britte said.