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(CNN) — Two U.S. fighter jets crashed into the Pacific Ocean on Thursday while operating at sea, the Navy said Friday.

Two F/A-18 Hornets that were operating aboard the aircraft carrier USS Carl Vinson crashed in the western Pacific, the Navy said.

One pilot was rescued, is being treated aboard the aircraft carrier and is in fair condition. There was a search under way for the other pilot, the Navy said.

The cause of the crash is under investigation, the Navy said. The jets have not been recovered.

A spokeswoman for the U.S. 7th Fleet could not confirm if the two jets collided.

The two jets crashed about 290 miles (470 kilometers) west of Wake Island, the spokeswoman, Lt. Lauren Cole, told CNN. Wake Island is more than 2,400 miles west of Hawaii.

Both jets are from Carrier Air Wing 17, the Navy said, assigned to Strike Fighter Squadron 94 and Strike Fighter Squadron 113.

A Navy cruiser, a destroyer and helicopters have been deployed in the search for the missing pilot, the Navy said.