Police are investigating the armed robbery of a pizza delivery man at Woodridge on Friday night.

Around 11pm, the 19-year-old man was delivering pizza on his bicycle when he was approached by two men on Smith Street.

One of the men produced a knife before demanding cash and the delivery man’s mobile phone.

The men fled on foot are were last seen heading in a westerly direction on Smith Road.

The delivery man was not physically injured.

Both men are described as Caucasian, early 20s with a slim to proportionate build.

One of the men was last seen wearing a grey hooded jumper covering his face and dark pants.

The other man wore a green singlet, balaclava and white shorts with a black stripe on the side.