Cameron: You are in our thoughts and prayers

A hand-written note at the bottom of the Prime Minister's letter to Mrs Fatima Khan says "You are in our thoughts and prayers".

The letter, dated December 20, calls Dr Khan's death a "sickening and appalling tragedy" and adds that "it is right that the Syrian regime should answer for it".

Read the full letter here

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Prime Minister: Syria must answer for UK surgeon's death

The Prime Minister has written a personal letter to the mother of a British surgeon who died in Syria calling his death as a "sickening" tragedy. Dr Abbas Khan's sister told ITV News that helping to find answers is "the least" the government can do.