Armed robber to face SA court

A Port Adelaide man who allegedly robbed supermarket staff at knife point has been arrested by police.

The man wore a black and white skull mask as he threatened staff at the West Beach Foodland supermarket on Tuesday night, police said.

It's alleged he stole cash but was later found at a nearby West Beach home where he was arrested.

The 32-year-old will appear in the Port Adelaide Magistrate's Court on Wednesday charged with aggravated robbery.