At least 10 were injured in a clash between law enforcers and pickets in Bera area of Pabna on Monday, the second day of the BNP enforced 60-hour hartal.
Officer-in-Charge Jahangir Hossain of Bera police station confirmed that the incident took place around 11am.
Police used 10 rounds of bullet to disperse a mob that had gone on a vandalising spree.
In another incident in the same district, a local Awami League office was vandalised and put on fire, said Biman Kumar Das, OC of Iswardi police station.
No one was arrested in either of the incidents.