The bomb, suspected to have been kept in a bag near the BJP office, went off at Dudhoi at around 7.30 pm killing one person, identified as Bapon Saha, district Superintendent of Police Nitul Gogoi told PTI.
The injured were taken to hospital.
The explosion caused panic in the area which was cordoned off by the police.
It was yet to be ascertained who set off the blast which also damaged two shops, police said.