Police are investigating after a woman was allegedly sexually assaulted at gunpoint in North York.

A 20-year-old woman was walking her dog in a park in the Finch and Don Mills area around 9:30 a.m. Sunday when a man approached her.

Police said he grabbed her, pointed a handgun into her rib cage and directed her to walk to a secluded area where he sexually assaulted her.

The suspect is described as black, in his 20s, with braided hair, tattoo sleeves on both arms, wearing a black tee-shirt and blue jeans.

He was armed with what is described as a black handgun, with a round barrel.

Police said the suspect is considered to be armed and dangerous and are asking anyone with information to contact them or Crimestoppers.