India's Prime Minister Manmohan Singh described attacks by communist insurgents known as Naxalites in some parts of his country as the biggest internal security threat facing the nation.

The Naxalites first began operating in 1967 and have gone on to infiltrate around a third of the country.

The BBC's Mike Thomson has been talking to a Naxalite couple who admit to taking part in the killing of dozens of policemen.

Get in touch with Today via email , Twitter or Facebook or text us on 84844.