A key partner in Sri Lanka's ruling coalition has threatened to quit if Colombo joins with Tamil Tiger rebels in distributing aid to tsunami survivors in rebel-held areas.

The Marxist People's Liberation Front, which holds a crucial 39 seats in the 225-member parliament, said it opposes a joint mechanism to distribute relief aid.

The threat came as Norway's peace-broker Erik Solheim held talks with the rebels about aid distribution in a fresh bid to revive the country's faltering peace process.

The joint mechanism is designed to make it possible for international tsunami aid to reach rebel-held areas. It could also lay the foundation for an end to Sri Lanka's civil war.

The December tsunami disaster killed more than 30,000 Sri Lankans and left many more homeless.

Some information for this story provided by AP and AFP.