A group of women were threatened with a knife and forced to hand over cash in a startling armed robbery at a popular Perth tourist spot.

According to police, the women were approached by a man at Elizabeth Quay in Perth’s CBD around midnight last Saturday.

The man, who was armed with a knife, demanded cash from the women.

Fearing their safety, the women complied and the man fled the scene.

It’s believed the same man was involved in a failed armed hold up of a supermarket in East Perth that night.

“About 11.30pm, a man entered the supermarket on Adelaide Terrace and approached the counter,” a WA Police spokesperson said.

“He threatened a staff member with a knife and demanded cash.

“The staff member refused to hand over any cash and the offender left the store empty-handed.”

The man is described as being fair-skinned and aged in his 30s or 40s.

He was wearing a grey hooded jumper and dark sunglasses at the time.

Anyone with information is urged to call Crime Stoppers on 1800 333 000 or report it online at www.crimestopperswa.com.au