SAN DIEGO -- Police were on the lookout Sunday for a driver in a Yellow Cab who was seen sitting nude about 2:30 p.m. in a taxi parked in Balboa Park behind the Air and Space Museum.

The driver was last seen leaving Balboa Park toward the Highway 163 northbound onramp. No other description or distinguishing characteristics were available for the cabbie.

Park rangers have reportedly received at least three separate reports in the last month about a Yellow Cab driver exposing himself on park grounds, whose museums and San Diego Zoo are a popular destination for tourists.