A Chinese Navy ship fired a laser at a U.S. surveillance aircraft flying over the Philippine Sea west of Guam, the Navy said Thursday. Officials acknowledged the incident more than a week after it happened.

The Navy said the People's Republic of China naval destroyer lased the American P-8A Poseidon aircraft in an act the U.S. deemed unsafe and a violation of international codes and agreements. The statement from U.S. Pacific Fleet said the laser was detected by sensors on the aircraft, but was not visible to the naked eye.

People’s Liberation Army Navy destroyer lased a #USNavy P-8A Poseidon aircraft in an unsafe, unprofessional manner. The incident took place Feb. 17 in the airspace above international waters 380 miles west of Guam. #FreeandOpenIndoPacific Read More: https://t.co/ogOCT9f9h3 pic.twitter.com/II5NaicQAw — U.S. Navy (@USNavy) February 28, 2020

"Weapons-grade lasers could potentially cause serious harm to aircrew and mariners, as well as ship and aircraft systems," the Navy said. The incident took place about 380 miles west of Guam.

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The Poseidon crew is deployed to Kadena Air Force Base in Okinawa, Japan. The squadron conducts routine operations, maritime patrol, and reconnaissance in the Pacific Fleet area.