ERIN, ONT.—Ontario Provincial Police say they’re investigating after two dozen portable outhouses were destroyed by a fire in a storage yard.

Investigators in Erin, Ont., say the fire is suspicious.

They say 24 Porta Potties were destroyed in the blaze, and several others were “affected by the heat.”

Police say they believe the toilets were clean at the time of the fire.

Damage is being pegged at $40,000.