Seven people have been arrested after elite British commandos boarded an oil tanker off the Isle of Wight that had been taken over by stowaways.
Troops seized control of the Nave Andromeda on Sunday after it was apparently hijacked by individuals hidden aboard as it reached UK waters from Nigeria.
Police said threats were made to the ship's crew but no injuries were reported. Hampshire police were investigating the incident following the arrests.
Sky News reported that about 16 commandos of the Special Boat Service (SBS) carried out the dusk raid, "roping aboard" the vessel from two Royal Navy Merlin helicopters, with two Wildcat choppers in support
The Ministry of Defence confirmed via Twitter that Defence Secretary Ben Wallace and Home Secretary Priti Patel approved the raid that recaptured the ship and detained the suspected hijackers.
Wallace personally praised the armed forces personnel who carried out the risky mission to regain control of the tanker.
"We understand the vessel has been boarded by security forces and made safe," said the UK Chamber of Shipping's chief executive, Bob Sanguinetti, who added, "We commend the swift action taken by UK personnel to secure the vessel and most importantly the safety of the crew."
The ship had been observed sailing a zig-zag course around the island, while the Associated British Ports agency said it had received no messages from the crew.
Nigeria has been gripped by unrest in recent days after unidentified uniformed soldiers opened fire on opposition protesters. On Saturday protesters looted a food warehouse and vandalised the Nigeria Labour Congress (NLC) building in Calabar, in the Cross River State.