The RNLI lifeboat from Weymouth, the Coastguard helicopters and a number of ships including Royal Navy destroyer HMS York and a US Navy supply vessel joined the hunt for the vessel overnight.

BBC: The Purbeck Isle

The preservation workers from New York's Central Park Conservancy were removing rust from the antique cannon, which once fired munitions aboard the British warship HMS Hussar, when they made the explosive discovery, New York police Detective Brian Sessa said.

CNN: STORY HIGHLIGHTS