US Navy Seals board rogue Libya oil tanker
The Pentagon said the operation was authorised by President Barack Obama.
The US has taken control of a tanker full of oil loaded from a rebel-held port in Libya, the Pentagon says.
The raid by Navy Seals took place in international waters south of Cyprus.
The Morning Glory's evasion of a naval blockade at the eastern port of Sidra prompted Libya's parliament to sack Prime Minister Ali Zeidan last week.
The Morning Glory was the first vessel to have loaded oil from a rebel-held port since a separatist revolt against the central government in Tripoli erupted in July 2013. It is not clear where the tanker was headed.
The Pentagon said the operation was authorised by President Barack Obama and that no-one was hurt.
"The Morning Glory is carrying a cargo of oil owned by the Libyan government National Oil Company. The ship and its cargo were illicitly obtained," a Pentagon spokesperson said, adding that it would now be returned to a Libyan port.
The vessel was flagged in North Korea but officials in Pyongyang said it had been deregistered because of the incident.
It was said to have been operated by an Egyptian company.