According to a US official, the US Navy has stationed at least 15 ships, including an aircraft carrier and 11 destroyers, in the Middle East, as it initiates a maritime blockade on traffic to and from Iran’s ports under President Donald Trump’s orders.

t’s unclear where exactly each ship is or which could be participating in the blockade; previous accountings of the vessels by CNN have shown them dispersed among the US Central Command area of operations, The Caspian Post reports, citing foreign media.

The ships include:

Aircraft carrier:

• USS Abraham Lincoln

Destroyers:

• USS Bainbridge
• USS Thomas Hudner
• USS Frank E. Petersen Jr.
• USS Delbert D. Black
• USS John Finn
• USS Michael Murphy
• USS Mitscher
• USS Pinckney
• USS Rafael Peralta
• USS Spruance
• USS Milius

Tripoli Amphibious Ready Group

• USS Tripoli
• USS New Orleans
• USS Rushmore

The USS Gerald R. Ford aircraft carrier, which has been participating in US operations in the war with Iran, moved to Greece for repairs last month but is now operating in the eastern Mediterranean, according to a public tracker by USNI News. The ship is joined by several destroyers and other support ships, but it would need to transit either through the Suez Canal or out of the Mediterranean and around Africa before it would be in a position to assist in the blockade.