One of the prosecution witnesses, Sanjay Kumar Tomar, who was a fire service official at that time, appeared before Chief Metropolitan Magistrate (CMM) Sanjay Khanagwal and recorded his statement.
The court concluded recording of his statement and posted the matter for further proceedings on July 6.
Apart from Ansals, Dinesh Chandra Sharma, a sacked record keeper of the trial court, Anoop Singh, Prem Prakash Batra, Harswaroop Panwar, Dharamveer Malhotra are facing trial in the case.
The Delhi High Court had earlier directed the police to register a separate case for alleged tampering of evidence on May 5, 2006, when the trial in the Uphaar tragedy case was on.
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Ansals, convicted in the main Uphaar fire case, are accused of colluding with others, including a court's record keeper, in destroying crucial judicial documents.
The documents allegedly proved that the Ansals, contrary to their claims, were the owners of the theatre at the time of the incident, the chargesheet said.