Mother of British doctor Abbas Khan who died in Syrian custody confronts regime

Crying with grief and anger, Fatima Khan stormed forward and shouted: "You killed my son!"

As Syria's warring sides held a sixth day of UN-brokered peace talks in Geneva, the mother of a British doctor who died in the custody of President Bashar al-Assad's regime confronted his aides Thursday.

Syria says that Abbas Khan, 32, was found hanging in a prison cell on December 16, 2013, and that he committed suicide.

His relatives are adamant he was murdered by his captors.