Four warships from three countries are searching the Arabian Sea for a sailor declared missing from the aircraft carrier Abraham Lincoln around 6:30 a.m. on Wednesday.

“A sailor was reported missing on board the Lincoln, prompting the command to hold a man overboard (response) which verified the sailor as missing,” said Lt. Samuel Boyle, a Navy spokesman at the Pentagon.

"A search of the ship did not turn up the sailor, prompting the at sea search. "

Lincoln and two of its escorts — the guided-missile cruiser Leyte Gulf and the Spanish guided-missile frigate Méndez Núñez — were continuing the hunt for the sailor, according to a prepared statement provided by the U.S. 5th Fleet to Navy Times.

The Navy has marked the unidentified sailor’s status as “Duty Status Whereabouts Unknown" while the search continues.

Update: This story has been amended to correct a mistake by U.S. 5th Fleet. Pakistan’s guided-missile frigate Aslat offered to help assist in the rescue efforts but it did not, in fact, join the search for the sailor.