A man was seen riding a mountain bike near Gosling Creek Reserve without wearing pants or underpants on Wednesday afternoon.
Canobolas Local Area Command acting inspector Yonneka Hill said police responded to a call at about 4.25pm Wednesday.
She said a man with a skinny build, light brown skin and a beard, wearing a hooded jumper, was last seen riding towards the playground at Gosling Creek Reserve.
"We conducted a patrol and didn't come across that person," inspector Hill said.
There is no indication the man reached the playground.
Inspector Hill said anyone with more information should contact the police or Crime Stoppers.