They were identified from videos shot during the attacks on Hidu households and temples.
Nasirnagar police's Officer-in-Charge Abu Zafar said: "We arrested these men after reviewing footage of the incident. There had been 78 arrests so far."
More than 100 people were injured after a mob attacked and vandalised 17 temples and 58 houses belonging to Hindus over a Facebook post defaming Islam allegedly posted by a Hindu fisherman.
Nasirnagar police's officer-in-charge and the UNO were subsequently transferred. The ruling Awami League suspended three of its local leaders for their involvement in the attacks.