Police are trying to trace a man who took his clothes off in Cleckheaton before leaving in a vehicle.
It happened last Thursday on Moor Bottom Road, when a man entered commercial premises, spoke to a member of staff then removed his clothes.
He was described as white, aged late 40s to early 50s, six feet tall with shaved brown hair, thinning in the middle. He was wearing a blue Lonsdale T-shirt and blue jogging bottoms.
Officers are also investigating a similar incident by a different man in Jessop Park, Batley, on Sunday.