A United Airlines flight experienced a close call with a drone as it prepared to land at San Diego International Airport, according to aviation authorities.

The incident occurred as the aircraft was on approach from San Francisco, though specific details about the proximity of the encounter or potential safety risks have not been disclosed.

Drone incidents near airports have become an increasing concern for aviation safety officials, as unauthorized drone operations in airport airspace can pose serious risks to commercial aircraft during critical phases of flight such as takeoff and landing.

The Federal Aviation Administration prohibits drone flights within five miles of most airports without prior authorization. Violations can result in civil penalties and criminal charges for operators who endanger aircraft.