American and British ships and aircraft were searching the Gulf of Oman on Tuesday after a U.S. sailor failed to report for watch and is believed to have gone overboard, NBC News reported.
The sailor is assigned to the USS Halsey, a Navy Destroyer, which departed its homeport of San Diego on Sept. 11. When the sailor was discovered missing, a man overboard was called, and both U.S. and British Navy vessels began a search.
"The sailor didn’t show up at their duty station in the time they were supposed to," spokesman Lt. Frederick Martin told the Navy Times. "They did a muster, didn’t find the sailor, and immediately commenced a search."
Helicopters from the Halsey, the USNS Rainier, and the Royal Navy's HMS Cumberland were currently conducting search and rescue operations, as well as F/A 18 Hornets from the USS Abraham Lincoln and a P-3 maritime patrol aircraft.
A U.S. military official tells NBC News that they have no reason to believe there is any foul play involved in the sailor's disappearance.
The sailor's name is being withheld while the search is ongoing.
The Gulf of Oman is an arm of the Arabian Sea that borders Iran and southwestern Pakistan to the north and Oman and the United Arab Emirates to the south.
NBC News Pentagon correspondent Jim Miklaszewski and NBC News producer Courtney Kube contributed to this report.