Unidentified persons set off an IED targeting CRPF personnel near the Assam State Transport Corporation ticket counter adjacent to the Paltan Bazar police station in Guwahati at 7:45 pm, police sources said.
Kamrup (Metro) District Deputy Commissioner Ashutosh Agnihotry said, a CRPF man, Bhawani Singh, was injured in the blast and died on the way to hospital, while nine others, including two CRPF personnel, were wounded.
Earlier reports said that a grenade was hurled.
The injured were immediately rushed to the Gauhati Medical College Hospital, Agnihotry said.
He said that there were intelligence reports that militants might attempt to attack security forces.
In Dhubri town's Indira Gandhi Road area, a petrol bomb was hurled at a house and stones pelted on six other houses at around 7:00 PM, police sources said.
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The police fired in the air after two communities clashed leading to injuries to three persons, of whom one died, the sources said.
The district administration clamped indefinite curfew in the town, they added.