Police yesterday detained eight persons for interrogation in connection with the murder of blogger Ahmed Rajib Haidar.
The Detective Branch of police, Criminal Investigation Department and Rapid Action Battalion are trying to unearth the mystery behind the murder, said DMP sources.
Of the eight detainees, three were rounded up by detectives on specific information.
Police, however, did not give identities of the detainees.
Rajib was found dead on the road near his house at Palash Nagar in the capital's Pallabi on Friday night.
The victim's father, Md Najim Uddin, yesterday filed a murder case with Pallabi Police Station without naming any accused.
Autopsy of Rajib's body was done at Dhaka Medical College morgue. The body bore eight stab marks, said morgue sources.
Contacted, Abdul Latif Sheikh, officer-in-charge of Pallabi Police Station, said a CID team has collected evidence of the murder from the spot. The case will be transferred to DB today.
Rajib's family members said he joined Shahbagh protesters and spent whole Thursday night with friends, younger brother and brother's wife. He returned home in the morning and wanted to go back to Shahbagh around 3:00pm. But very tired, he could not do so.
In the evening, Rajib went outside to take tea with one of his friends and was killed on his way back home.
Some neighbours told his family members that they saw two unknown youths near of his house since the evening. They were acting suspiciously and seemed waiting for someone. According to witnesses, killers left the place using a road to Baishtek.
Meanwhile, locals in Mirpur yesterday staged demonstrations demanding arrest and exemplary punishment to the killers of Rajib.