The officers were guarding road workers in the Sukma district, which has seen a long-running insurgency by Maoists.

The details of the attack are sketchy, but one report said it was carried out by 300 rebels.

The Maoists say they are fighting for communist rule and greater rights for tribal people and the rural poor.

Their insurgency began in the eastern state of West Bengal in the late 1960s, later spreading to more than one-third of India's 600-plus administrative districts.

The attack on the personnel of the paramilitary Central Reserve Police Force (CRPF) began at 13:00 local time on Monday and the clashes went on for a few hours, reports said.

It is not yet known if the Maoists suffered any casualties.

India's Home Minister Rajnath Singh later tweeted about the attack:

Indian media reports say helicopters have been used to transport the wounded to the nearest medical facility.

Extra security personnel have been now been sent to the location to look for the attackers.

The rebels are active in several eastern and central states of India.

They routinely target Indian security forces. In 2010 they killed 74 policemen in the Dantewada district in Chhattisgarh in one of the most deadly attacks.