British national 'killed in Syria' 31 May 2013 Last updated at 10:03 The Foreign Office is investigating reports that a British man has been killed in Syria along with two others. The Syrian Observatory for Human Rights, a UK-based monitoring group, says the man had a British passport stating he was from London but could not verify its authenticity. The SOHR said the man was Muslim and might have been working with Syrian rebels, but could not confirm this. The man was killed along with an US woman and another man, the SOHR said. The body of the man thought to be British, which was found in Idlib province, was now with the Syrian regime, a SOHR spokesman added. A Foreign Office spokeswoman said: "We are aware of the claims. We have no verification, but are seeking information. The UK has warned for some time against all travel to Syria. All British diplomats have been withdrawn from Syria amid the escalating bloodshed between the government forces and rebels. The death is thought to have happened on Wednesday, the same day British doctor Isa Abdur Rahman, 26, a graduate of Imperial College London, was killed in the same area.