At least nine supporters of BNP and Jamaat-e-Islami candidates were injured following a clash between the groups in Ullapara on the first day of campaigning on Thursday.
The identities of the injured could not be immediately confirmed, said Officer-in-Charge (Investigation) of Ullapara Model Police Station Rupkar.
OC Rupkar said both sides were campaigning in Tetulia village under the Sirajganj-4 (Ullapara) constituency when a verbal argument escalated into a physical clash.
Supporters from both sides reportedly chased each other, and private cars and motorcycles belonging to Jamaat supporters were vandalized.
Police rushed to the scene and brought the situation under control. Patrolling has been strengthened in the area to prevent further clashes.
Legal action will be taken if any formal complaints are filed regarding the incident, added the OC.