A sixth British jihadist has reportedly been killed fighting in Syria.

The death of the man was first reported on the jihadist Twitter account @Zhoof21 yesterday afternoon.

He has been named as Abu Naseebah al-Britani by Shiraz Maher, head of outreach at Kings College London's International Centre for the Study of Radicalisation (ICSR).

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Chales Lister, an analyst at Jane’s Terrorism and Insurgency Centre, added that he is believed to have been killed fighting for the al-Qa’ida linked ISIS (the Islamic State of Iraq and al-Shams) in Deir Atiyah, north of Damascus.

No further details about the man are currently available.

The death follows a reports that four British men have died fighting for the al-Qa’ida linked al-Nusra Front in Syria over the summer.

Three of the men, all thought to have been from London, were killed as they attacked forces loyal to President Bashar Assad near Aleppo.

A fourth man, fighting for the same group was shot two weeks later during an ambush on an enemy position. He has been named by the Times as Mohammed el-Araj, 23, from Ladbroke Grove, west London.

A fifth man, Ibrahim al-Mazwagi, 21, from North London is believed to have been killed in February.

MI5 estimates suggest that 200-300 Britons have travelled to Syria to fight against President Bashar al-Assad’s forces, some of which have joined forces influenced by Islamic extremism.

A new study by charity Hope Not Hate suggests that a groups linked to British Islamist preacher Anjem Choudary have “facilitated or encouraged” up to 80 young Muslims from the UK to join al-Qa’ida-linked forces in Syria.

The reports have raised concerns that the men may pose a threat to UK security when they return home after their part in the war is over.