A British hostage being held by Islamic State (IS) has said prisoners of the militant group who have tried to escape have been punished with waterboarding.

The statement came in the latest video featuring 43-year-old journalist John Cantlie, who was seized in late 2012.

Mr Cantlie reads an apparently scripted message that criticises the British and US's stance on hostage negotiations.

He quotes from emails in which families of hostages allegedly complained about the US refusal to negotiate with IS.

One message, which Mr Cantlie dates to 17 July this year, allegedly said: "We have begged them so many times already. Everyone has buried their heads in the sand.

"We feel we are caught in the middle between you and the US government, and we are being punished."

Referring to the hostages' treatment by the captors, Mr Cantlie says: "Some of us who tried to escape were waterboarded by our captors, as Muslim prisoners are waterboarded by their American captors."

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