Underwater explorers in Madagascar say they have discovered treasure belonging to the notorious 17th-Century Scottish pirate William Kidd.

A 50kg (7st 9lb) silver bar was brought to shore on Thursday on the island of Sainte Marie, from what is thought to be the wreck of the Adventure Galley.

The bar was presented to Madagascar's president at a special ceremony. US explorer Barry Clifford says he believes there are many more such bars still in the wreck.

Capt Kidd was first appointed by the British authorities to tackle piracy but later became a ruthless criminal and was executed in 1701.

The team believes the bar, marked with what appears to be a letter S and a letter T, has its origins in 17th-Century Bolivia.

It believes the ship it has found was built in England, however there is bound to be scepticism and calls for more proof that the bar was linked to Capt Kidd, our reporter says.

The location of the ship, thought to have sunk in 1698, has been known about for many years but the silver bar was only discovered earlier this week.

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Pirate Captain Kidd's 'treasure' found in Madagascar (www.bbc.com/news/world-africa-32621444)