Low-flying military style helicopters circled Port Angeles for about an hour around midnight Thursday, but the reason is a mystery.

No military or law enforcement agency contacted by the Peninsula Daily News claims the copters.

Police said an earlier report the copters were from Whidbey Island Naval Air Station was incorrect. The Coast Guard, Army National Guard and Customs and Border Protection also said they weren't their aircraft.

The Clallam County emergency dispatch system received about 30 calls from residents about the helicopters.