"As of now five persons have died in a bomb blast at Bajrapara near the Jalpaiguri town. The explosives were laden on a bicycle. It went off on the culvert over a small river," Shashikant Pujari, IG North Bengal, told PTI.
The incident happened at Bajrapara area at around 7 pm.
"We have launched an investigation. We are yet to ascertain whether it is a terrorist attack or a carrier was carrying explosives and it went off accidentally," said Pujara.
Javalgi said the police was trying to ascertain if the attack was linked to the KLO.
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"It can be assumed that the person or persons riding the bicycle were among the dead," he said.
The bicycle lay mangled in the middle of the culvert.
Dr Susanta Ray at the Jalpaiguri Sadar Hospital where the injured have been admitted said some of them were in a critical condition.
North Bengal Development Minister Gautam Deb said that the government would not tolerate this sort of activity and it would be dealt with sternly.