Bharatiya Janata Party (BJP) leader Ravi Shankar Prasad attacked Prime Minister Manmohan Singh accusing him of misleading the house.
"The PM did not speak the truth and misled the house. A fair investigation has been denied by the government," said Prasad.
Minister of State for Parliamentary Affairs Rajeev Shukla responded: "There is no question of cover up as the prime minister has made it very clear that efforts are being made to trace and retrieve each and every document."
Amidst the commotion, Deputy Chairman P.J. Kurien adjourned the house till 12:30 p.m.
The house was earlier adjourned till noon following protests by Samajwadi Party (SP) and Bahujan Samaj Party (BSP) members over reservation for backward classes in promotions in government jobs.