Two bomb blasts near the residence of West Bengal Chief Minister Buddhadeb Bhattacharjee Friday morning in central Kolkata led to tension in the area, but police said it was the result of a group clash and had nothing to do with his security.

The blasts were the result of a clash between two groups of Congress workers in which one person was injured, City Police Commissioner Prasun Mukherjee told PTI.

Three persons, allegedly carrying nine crude bombs, were arrested by the security personnel posted near the chief minister's residence, he said.

Mukherjee said the blast took place when members of one of the groups, carrying the explosives, were trying to flee after being chased away by the other group near the CM's residence.

The security personnel at the chief minister's residence rushed to the spot and arrested three persons, he said.

"It was neither a terrorist activity nor anything to do with the chief minister's security," Mukherjee said adding, the security in the area has been beefed up following the incident.