The hand of Maoist guerrillas is suspected in Wednesday night's attack at the CPI-M office in Nawada in Murshidabad, about 250 km north of here, with the reported recovery of posters of a rebel group.

However, Inspector General of Police (Law and Order) Raj Kanojia told IANS: "We are looking for the miscreants behind the attack but we are not saying they were Maoists right now."

"The office of the CPI-M was damaged and there was an attempt to set it on fire," Kanojia said adding: "No one was injured."

Some reports said one of the attackers was a woman and the posters left at the spot belonged to Maoists.

CPI-M cadres in Murshidabad allege that Congress men were behind the attack. The district is a stronghold of the Congress.

Tension prevails in the area.

After a brief lull, Nandigram witnessed fresh tension Wednesday as Trinamool Congress supporters ransacked an office of the CPI-M at Tekkhali after bombs were allegedly hurled on a procession taken out by the former.

Things came to a boil in West Bengal's Nandigram area a week ago when 14 people were killed in police firing while protesting the acquisition of farm land for a special economic zone. Indian Muslim Info