The Foreign Office is investigating reports that two white British al Qaida members have been killed in a drone attack in Pakistan.
The Muslim converts are said to have died in a Hellfire missile strike by a remote-controlled US aircraft near the town of Datta Khel six days ago.
The militants, aged 48 and 25 and using the pseudonyms Abu Bakr and Mansoor Ahmed, were apparently in a vehicle in the mountainous region with two other fighters at the time.
A Foreign Office spokeswoman said: "We are aware of media reports of the death of two British nationals in Pakistan.
"Our High Commission in Pakistan is seeking further information on these reports."