'Let the prime minister visit Bodoland and see the development works personally. We would welcome any investigation,' Daimary said.

Angry at the prime minister's statement, BPF leaders led by Mohilary late Tuesday met union Home Secretary G.K. Pillai in New Delhi to lodge a formal protest.

'We expressed our displeasure at the factual error in the prime minister's written speech and asked him to communicate our point of view,' the BPF leader said.

'We would appreciate a clarification from the Prime Minister's Office on this issue.'

Chief Minister Tarun Gogoi has also admitted that the central package was for Rs.500 crore and that another Rs.250 crore was to be sanctioned upon completion of the first package.

The BPF with 10 legislators in the 126 member Assam assembly is a key partner of the Congress party that has 54 legislators. There are five associate members and five independents supporting the government.