Edmonton police have released a composite sketch of a man they say tried to sexually assault a woman earlier this week in Mill Creek Ravine.

On Tuesday, a 26-year-old woman said she was dragged off the path in Mill Creek Ravine by a man with a knife.

The attack happened at 5 p.m. near 76th Avenue and 95th Street.

The woman screamed for help. When someone responded, the attacker ran off.

Police used dogs to track the suspect but failed to pick up a trail.

The suspect is described as a black male in his mid- to late-20s, about 5'10 with a thin build, a goatee and short hair. He was wearing a light-coloured, long-sleeved shirt and may have been wearing glasses.