Kolkata, Feb 15 (IANS) A group of 20-strong Maoist ultras attacked a joint forces' camp in West Midnapore district of West Bengal Monday, police said.

According to police sources, the incident took place at Shilda locality in the district when a group of Maoists opened fire at central paramilitary force troopers at a joint forces' camp.

'We have got information that a group of Maoist rebels attacked a joint forces camp at Shilda locality and also set it afire. We have not been able to contact any of the joint forces personnel so far.

'We are now sending reinforcement to the spot,' state Inspector General of Police (Western range) Kuldip Singh told IANS.

'We have not received any report of casualty so far,' Singh said.

According to local sources, the leftwing ultras came on bikes and ransacked the joint forces' establishment, took away firearms and later set ablaze the camp.

The Maoists also planted landmines at Narayanpurchak area and scattered around pamphlets while escaping, police said.