While the police, which has now sought the help of the FBI and Interpol, has arrested Shafiur Rahman Farabi (29) as the alleged mastermind, there is no explanation why his provocative posts in the social media had been ignored. Farabi, released on bail in August, 2013, after he was arrested for the killing of another rationalist, Ahmed Rajib Haider, had singled out Roy as the next target. In February 2014, he wrote ominously on Facebook: “Avijit Roy cannot be killed immediately because he lives in the US, but as and when he sets foot on Bangladesh, he will be murdered.” His threat seems to have escaped attention, despite Roy’s father lodging a police complaint.