Dhaka: Bangladesh police onWednesday handed over evidence related to the brutal killing of American blogger-writer Avijit Roy to FBI.
"We have handed the two machetes believed to be used in the murder, a bag, the blood sample and several other evidence over to FBI," police spokesman Monirul Islam told reporters.
He said Bangladesh police had obtained the required court permission for getting the evidence examined in the FBI laboratory ahead of handing over the material to the US investigation agency.
Police had seized two machetes, wrapped in newspapers, and the bag containing some clothes and painkiller pills, just 50 yards away from the crime scene after the February 26 hacking of Roy.
The FBI joined hands in the investigation after Bangladesh accepted a US offer to assist in the probe.
Agents of the US agency have inspected the murder site at the premier Dhaka University campus and talked to slain blogger's father, noted physicist Professor Ajay Roy.
45-year-old Roy, known for his critique of religious extremism, was hacked to death in the university area by machete-wielding assailants, who attacked the Bangladeshi-origin writer as he was returning from a book fair with his wife last month.
Roy's wife Rafida Ahmed Bonya, who suffered head injuries and lost a finger in the attack, said she could identify the assailants as she remebered their faces.
The killers were five in number an all were in their mid 20s, attired in jeans and T-shirts, she said.
Bangladesh's elite anti-crime Rapid Action Battalion (RAB) earlier this month arrested the key-suspect of the murder -- Farabi Shafiur Rahman.
Rahman has confessed that he had threatened to kill the blogger in his Facebook and Twitter postings.
An engineer by profession, Roy came to Dhaka along with his wife Bonya, also a Bangladesh-born US citizen and fellow blogger, with the country's annual Ekushey Book Fair being held at the Bangla Academy near the Dhaka University campus.
He founded Mukto-Mona or "Free Mind" blog site in 2000 to champion secular and humanist writing.
Police said they were investigating the involvement of 'Ansarullah Bangla Team', an Islamist extremist group based in Bangladesh, that claimed responsibility for the attack without making it clear that Farabi was linked to the outfit.