'Four men have been arrested after special forces stormed a cargo ship off the UK's coast, where a group of stowaway migrants had threatened staff on-board.
Special Boat Service (SBS) operatives from Sabre Squadron fast-roped from helicopters on to the ship, which had been sailing in the Thames Estuary, sources told Sky's defence and security correspondent Alistair Bunkall.
The operation lasted around 25 minutes and no one on board was injured.
Essex Police said the vessel was taken to the Port of Tilbury and four men were arrested under the Immigration Act when the ship docked just after 4.20am this morning.
Officers boarded the 236-metre long cargo ship, called the Grande Tema, shortly after 11pm last night.
Its operator, Grimaldi Lines, had earlier reported that four stowaways armed with iron bars demanded for the crew to navigate closer to the coast.
The Home Office has told Sky News that the men presented themselves as Nigerian and Liberian nationals.
The company's spokesman Paul Kyprianou told Sky News: "The vessel was coming from Nigeria... They managed to escape from the cabin and started threatening the crew, requesting to have the vessel navigate very close to the coast.'
Read more: Special forces retake cargo ship after migrants threatened staff