POLICE are investigating the robbery of a pizza delivery driver in Thirroul on Saturday night.About 6.40pm, a 17-year-old female delivery driver arrived at a Princes Highway Drive address to deliver a pizza. Two men allegedly approached the delivery vehicle and banged on the windows, before they both walked away.One of the men is described as being in his late teens or early 20s, of thin build, wearing a dark hooded jumper and prescription glasses.The other man is described as being in his late 20s, with stubble on his face and wearing a tee-shirt.The girl got out of the car to deliver a pizza, when she was allegedly pushed up against the car by another man, who demanded money. She gave him the money, and the man ran away onto Pass Avenue. He is described as being 188cm tall, of medium build, wearing a grey jumper and long pants.