Woman sexually assaulted in Adelaide

A woman has been sexually assaulted near an Adelaide train station.

The victim, aged in her mid-20s, was grabbed while walking down an alley near Hallett Cove Beach station shortly after 11pm on Friday.

Her attacker then fled. He is described as Caucasian, aged about 30 and 175cm tall with a stocky build, dark curly hair and facial stubble.

He was wearing a blue long-sleeved shirt with white or cream pants.

Anyone with information is urged to contact Crime Stoppers on 1800 333 000.