Seven persons were injured, four of them critically, when unidentified miscreants fired indiscriminately, exploded grenades and burnt some houses in two villages of Assam's strife-torn Kokrajhar district on Monday night, police said.
More than 20 houses were set ablaze and seven injured in the firing at Pakritala area. The injured were taken to a local hospital where the condition of four of them was stated to be serious.
Security personnel from a CRPF camp located close to the attack site retaliated with bullets and the encounter was on till late in the night.
In another incident of firing at Chouta Haki village, two persons were injured.
Senior police officials have rushed to the spot to monitor the situation.
Ever since violence erupted in the Bodoland Territorial Administered Districts and Dhubri since July 19, at least 87 people have been killed, according to official figures.