Dhaka: Al Qaeda in the Indian Subcontinent (AQIS) has claimed responsibility for the murder of an American atheist blogger in Bangladesh over two months ago, according to SITE Intelligence Group.

Avijit Roy was hacked to death by two assailants with machetes on the streets of the capital Dhaka in February as he returned from a book fair with his wife.

AQIS leader Asim Umar said his organisation was responsible for the attack in a video posted on jihadist forums on Saturday, according to SITE, a US website that monitors extremist groups.

He also claimed the murders of other ‘blasphemers’.

A spokesman for Rapid Action Battalion (RAB), which is tasked with tackling militancy in the Muslim-majority nation, said it couldn't be certain the claim was correct.

‘We are not sure,’ Mufti Mahmud told AFP when asked if Al Qaeda was behind the deaths of Avijit and bloggers Ahmed Rajib Haider and Washiqur Rahman.

Rajib and Washiqur were also killed by machete-wielding attackers. Rajib died in 2013 and Washiqur was hacked to death in March.

A little-known Bangladeshi militant group called Ansarullah Bangla Team (ABT) has also apparently claimed responsibility for Avijit's murder via a twitter account which police have not been able to verify as genuine.

The Bangladesh-born writer, who emigrated to the southern US state of Georgia some 15 years ago, was well known in his native land for his Mukto-Mona (Free-mind) blog where he railed against all forms of organised religion.

He was also the author of a series of books, including the best-selling ‘The Virus of Faith’, which was hugely contentious in Bangladesh, an officially secular state where around 90 percent of people are Muslim. 

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