VIRGINIA BEACH, Va. (WVEC) -- U.S. Navy personnel saw two drones in the airspace above Naval Air Station Oceana Thursday, raising concerns about safety at the installation.

The Navy says the two incidents happened during flight operations.

Flight line personnel spotted a white quad-copter flying near aircraft hangers in the early morning hours. A few hours later, a Navy pilot flying an F/A-18 Horney saw a black quad-copter in the landing pattern at NAS Oceana.

Officials want people in the area to understand that flying an unmanned aircraft in unauthorized airspace is not only illegal, but puts residents and the crew at the installation at risk.

People who violate the restrictions could face civil penalties and criminal charges, including possible jail time.

The Navy urges everyone to refrain from flying drones around any base, including ones that conduct aviation operations.