The Foreign Office is investigating reports that a British Islamist has been killed in Somalia after falling out with the al-Shabaab terror group.
The BBC quoted witnesses as saying the man known as Osama al-Britani - a UK citizen of Pakistani origin - and Omar Hammami, an American also known as al-Amriki, died in an early morning attack in a village near the capital, Mogadishu.
A Foreign Office spokeswoman said: "We are aware of reports of the death of a British national in Somalia and are looking into this."
Al-Amriki was among the most prominent foreign militants fighting in Somalia.
The BBC said it had been told by one of high fighters that he and al-Britani were overpowered in the attack by al-Shabaab on a village near the town of Dinsor.
Their deaths were said to have been confirmed by local residents and a senior source in al-Shabaab.
There have been a number of previous reports of al-Amriki's death since he fell out with the top al-Shabaab commander, Ahmed Abdi Godane.
However earlier this month he surfaced in an interview with Voice of America's Somali Service in which he denounced Godane as a dictator and said that he had finished with al-Shabaab and al Qaida.