Attack in Adelaide toilets a 'major crime'

A man remains at large after violently assaulting a woman in public toilets at an Adelaide shopping centre, with police now declaring the attack a major crime.

The man was armed with a knife when he attacked the 30-year-old cleaner on Sunday night, leaving her with serious face and back injuries.

Police have appealed for public help to find a suspect captured on CCTV, who is described as caucasian, aged in his 30s and as having facial hair.