Bangladeshi security officials say they have arrested an Islamist over last week's murder of the atheist US blogger Avijit Roy, accusing him of being behind earlier death threats on social media.
"He is the main suspect" in the killing of Roy, said a spokesman for the Rapid Action Battalion (RAB) after Farabi Shafiur Rahman was arrested in the capital Dhaka.
"He is a fundamentalist blogger," RAB spokesman Major Maksudul Alam said, adding that according to "primary information", Farabi had threatened Roy through Twitter and Facebook.
"(Roy's) family told us that he got threats from Farabi several times," he added.
A source in the RAB said the elite force, mainly tasked with tackling religious militancy in the Muslim-majority country, has seen correspondence between Farabi and another person about killing Roy.
Roy was hacked to death with a machete in downtown Dhaka on Thursday.
Farabi was also arrested after the murder of atheist blogger Ahmed Rajib Haider in February 2013, but was later released on bail.
He has been known for his Facebook postings against atheist writers.
Roy, who was the founder of the Mukto-Mona (Free-mind) blog, was born in Bangladesh but moved to Atlanta in the southern US state of Georgia around 15 years ago.
He and his wife, who was badly injured in the attack, had been returning from a book fair when they were both hauled off their rickshaw by two assailants who then slashed them with the machetes.
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