The main group fighting an insurgency in Thailand's largely Muslim south has held its first meeting with officials from the new Thai government and set out demands as a condition for any formal peace talks.

The insurgency in the Malay-speaking region of the predominantly Buddhist country has killed some 7,000 people over the past 15 years and has flared on and off for decades.

Officials of the Barisan Revolusi Nasional (BRN) said they had met a Thai delegation at a location in Southeast Asia on Friday and demanded the release of all people detained over suspected links to the insurgency and a transparent investigation into abuses by security forces.