Niloy Chakrabarty Neel, 29, popularly known by his pen name Niloy Neel, was killed by assailants inside his fifth-floor flat at North Gorhan in the capital Dhaka where he lived with his family on August 7.
The five assailants entered the flat after Friday prayers, pushed his wife and one of his friends aside and then hacked him to death.
Police yesterday arrested Kausar Hossain Khan and Kamal Hossain Sarder in raids and they are suspected to be members of Ansarullah Bangla Team, Detective Branch Deputy Commissioner Mahbub Alam said.
Earlier police had arrested Saad Al Nahin, nephew of junior Labour and Employment Minister Mujibul Haque Chunnu, and Masud Rana for their suspected involvement in the murder.
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Neel, an official of NGO Ganajagaran Mancha, was known for his secular write ups in blogs. The NGO waged a massive campaign for the capital punishment for war criminals who carried out atrocities siding with the Pakistani troops in 1971.
Neel's murder is the fourth such brutal murder in the country. Machete-wielding masked men in May hacked to death 33-year-old Ananta Bijoy Das, a secular blogger, in Sylhet city.
A month after Roy's killing, another blogger Washiqur Rahman was murdered in similar fashion in Dhaka but people in the neighbourhood nabbed two suspected killers from the scene and handed them over to police.
All three killed were involved with the Ganajagaran Mancha.