At least 22 troops were killed when armed Maoists attacked a camp of the paramilitary forces in India’s West Bengal state on Feb. 15, 2010.
Nearly 50 rebels on motorcycles encircled the camp of the Eastern Frontier Rifles (ERF) at Silda village on Monday and started firing on it.
More fighters joined the assault on foot, firing from automatic weapons.
More than 6,000 people have died during the rebels’ 20-year fight for communist rule in many Indian states.
The Indian government recently began a major offensive against the rebels in several states.
Indian Prime minister Manmohan Singh has described the Maoist insurgency as India’s “greatest internal security challenge”.
The Maoist rebels now have a presence in 223 of India’s 600 or so districts.