Panic spread in the sleepy Bangalore neighbourhood after a huge explosion was heard outside the BJP office in Malleswaram. Soon afterwards a number of vehicles parked in the vicinity caught fire.
Eyewitnesses said glass windows of a nearby building were shattered due to the blast.
The injured were initially rushed to KC General Hospital.
The entire area has been cordoned off. Multiple forensic teams are at the spot and are looking for clues.
There was a huge crowd of BJP workers at the party office as today was the last day to file nominations.