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Alexei Navalny, Russia's most prominent opposition figure, has said he may have been poisoned.

The 43-year-old was taken to hospital with a swollen face, eye problems and rashes on his body. He was in jail for calling for unauthorised protests.

Initial reports suggested that he had suffered an acute allergic reaction, but his doctor suggested he might have been exposed to "some toxic agent". Mr Navalny says he has never suffered from allergies before.

Exiled opposition activist Vladimir Ashurkov says he believes a 鈥渢oxic agent could have been administered through a pillow or through a pillowcase鈥� while Navalny was out during a walk.

International Editor Gabriel Gatehouse reports.