A crude bomb exploded on Sunday near the Tata Motors' small car project site, but there were no casualties.

The explosion occurred in the early hours of Sunday at Gopalnagar-Bosepukur area adjacent to the boundary wall of the controversial project site. The blast damaged a part of the wall and caused panic among the workers, police said. 

The workers and locals immediately informed the police, which rushed to the spot with bomb disposal squad and found seven 'bomb-like' objects, Hooghly Superintendent of Police Supratim Sarkar said.

He said the entire area has been cordoned off to avoid any untoward incident.

IGP (law and order) Raj Kanojia told PTI in Kolkata that initial investigation revealed that an explosion of a crude bomb damaged a part of the wall of the project site and caused panic among workers.

"Those responsible for the explosion are yet to be identified. This is simply a crude bomb and not anything like landmine or similar such explosive," Kanojia said adding that no arrest had been made in this regard.

Security has been intensified in the area.

The work on the small car project, which has faced agitation against land acquisition, has already started a couple of months back and over the last few days the work at the site had picked up with nearly 1,000 workers joining work at the main plant.