The truck ran over and killed six persons including a 'chaukidar' and injured several others near a traffic roundabout on National Highway-84 under Industrial police station last night, Buxar District Magistrate Raman Kumar said.
The driver abandoned the vehicle and escaped. Efforts were made to nab him, he said.
Soon after the accident, Kumar said, several hundred irate locals assembled on the spot and torched an anti-riot vehicle that had been sent to control the mob.
They also torched a check post over the Ganga Bridge in Buxar. A fire engine, which rushed to contain the flames, was also set ablaze.
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The rampaging people attacked the police personnel and administrative officials as well as injured several policemen.
The violence continued for several hours before additional forces were rushed to the troubled area.
"The situation is normal now. Monetary help under various government schemes is being provided to the kin of the deceased to facilitate last rites. Four FIRs have been registered in the incident and we are trying to identify those resorted to violence and arson," Kumar said.