UPDATE: Police have released a comfit of the man who robbed an 18-year-old pizza delivery girl robbed at knife-point while working in Mt Lofty.
Police said the teen was flagged down by a group of men while on her way to a delivery in Alfred St about 5pm yesterday.
"After she handed over the pizzas, one of the men produced a knife and demanded money," police said.
"When she complied, the man also took her phone.
"The men were last seen running south down Alfred St."
The teen was not physically injured as a result of the incident.
One of the men is described as being Caucasian in appearance, in his early 20s and of a proportionate build with short brown or blonde hair.
He was wearing a white hooded jumper, a flat peaked cap and a pair of black faded ¾ length shorts.
Anyone with information should call Crime Stoppers on 1800 333 000.