Adelaide bus driver bashed: police

A bus driver has allegedly been repeatedly punched by a man outside a shopping centre in Adelaide's north.

The man boarded the bus at Arndale Shopping Centre about 7.30am on Thursday, rained blows about the driver's head and body, then left, SA Police say.

The bus driver suffered minor injuries.

His assailant is described as Caucasian and aged in his 20s with a heavy build, dark, curly hair and an unkempt appearance.

He was wearing a cream or coffee-coloured Nike jumper and jeans.