The police foiled a bid to set fire to some pillars on the fenced area of the acquired land for the Tata Motors' small car project at Singur early on Tuesday morning.
IGP (law and order) Raj Kanojia said three persons had tried to set fire to the wooden pillars but were chased away by the patrolling police.
There was not much damage to the pillars, Kanojia said.
The police officer said this was the second attempt to damage the pillars after construction work by Tata Motors began on Sunday.
Security has been stepped up but no arrests could be made till 11 am, Kanojia said.
Prohibitory order continued to remain in force at Singur to ward off untoward incidents.
Trinamool Congress activists, spearheading the movement against acquisition of about 1000 acres of farmland at Singur for the ambitious Rs 1,000 crore project to produce Rs one lakh car. Tata Motors officials were not immediately available for their comments.