London: The British Royal Navy has captured 13 Somali pirates in the Indian Ocean, defence ministry said.

A British Royal Fleet Auxiliary (RFA) supply ship and a US Navy vessel intercepted the pirates' boat, which refused to stop despite warning shots fired from a British helicopter.

The British Navy then sent commandos to board the boat, capturing the pirates and seizing their weapons, as reported on Friday. Defence Secretary Philip Hammond said the British troops, part of a NATO-led counter-piracy force, could be "proud" of the success.

Captain Gerry Northwood, who leads the operation, said Tuesday's capture will "send a clear message to other Somali pirates that we will not tolerate their attacks on international shipping".

Earlier this week, the same British ship, RFA Fort Victoria, foiled an attempt by Somali pirates to attack cargo ships in the Indian Ocean, the ministry added.