Couple and baby escape Adelaide car fire

An Adelaide couple was driving home with their baby when their car burst into flames.

Authorities are investigating a suspicious fire which engulfed a shop in Adelaide. (AAP)

A couple and their baby have escaped a car fire that destroyed their vehicle in Adelaide.

The young couple was driving home with their baby in their car about 3.30pm in Para Hills when the vehicle began filling with smoke.

They took the baby out of the car and rang emergency services, but the car was engulfed by flames by the time firefighters arrived, and was completely destroyed.