SASKATOON -- The Saskatoon Fire Department says a fire in a backyard is believed to be suspicious.

Shortly after 11:00 a.m. fire crews were called to a property in the 400 block of Avenue I south.

In a news release, the fire department said crews arrived to find a mattress, couch, shed and fence on fire.

No one was injured in the fire but investigators are working to try and determine the cause.