New Delhi, Aug 20 (IANS): Both houses of parliament were Tuesday disrupted over the BJP's demand for a statement by the prime minister on the missing files related to the allocation of coal blocks.

The Lok Sabha and Rajya Sabha were both adjourned till noon. When both houses reassembled, Lok Sabha was again adjourned till 1 p.m. following noisy scenes.

As soon as the Rajya Sabha assembled at 11 a.m., members of the Bharatiya Janata Party (BJP) raised the issue of the missing files.

BJP leader Ravi Shankar Prasad said Prime Minister Manmohan Singh should make a statement on the issue.

The house was first adjourned for 10 minutes on this issue.

When it met again, Coal Minister Sriprakash Jaiswal rose to make a statement following which BJP members disrupted the house again, forcing it to be adjourned till noon.

Jaiswal Saturday admitted that some files related to coal blocks allocations had gone missing.

In the Lok Sabha, the price rise issue was raised by the left parties and Janata Dal (United) when the house assembled at 11 a.m., forcing Speaker Meira Kumar to adjourn the house for half-an-hour.

When it reassembled, Leader of Opposition in the Lok Sabha Sushma Swaraj demanded a statement from the prime minister on the missing files relating to the coal blocks issue following which the house was adjourned till noon.

Noisy scenes when the house met again forced adjournment -- this time till one p.m.