South Portland police are looking for three suspects who allegedly robbed a pizza delivery driver of cash and a pizza at gunpoint. Police say the driver was delivering a pizza to a customer in front of an apartment complex at 10 p.m. Saturday when two men armed with a knife and a handgun approached and demanded cash. The suspects took a small amount of cash and the pizza and fled on foot. Police say they think the supposed customer, who also ran, is involved in the robbery. Police describe the suspects as black men in their early 20s. Nobody was injured.