HALIFAX -- Police are investigating after a photo posted on social media appeared to show a clown standing on a sidewalk outside a Halifax high school.

Const. Dianne Woodworth says students at Halifax West High School advised staff of the photo posted to Instagram Tuesday morning.

Woodworth says police went to the school, but nothing suspicious was found.

She says an investigator is looking into it further, although there is no threat to the public.

The photo was posted to an Instagram account called Halifax Clowns.

There have been sightings of creepy clowns across North America in recent months, with most being hoaxes or social media-fuelled pranks.

Teenagers who were photographed in August wearing clown masks and wielding a chain allegedly chased home kids from a park in Gatineau, Que.

Gatineau police declined to charge the teens as no crime was committed.