Crucial evidence relating to the Commonwealth Games scam has once again been tampered, with important files in the computer of the chief vigilance officer (CVO) of the organising committee (OC) having been wiped out on Sunday morning, The Indian Express reported.

Jarnail Singh, the CEO of the committee, says an analysis of the computer of Gurjot Kaur, the CVO, revealed that the computer was activated on Sunday morning when the OC office was closed, and all the files deleted. The OC is filing a complaint with the Delhi police.

But this is not the first time that the computers in the OC offices have been tampered with. Last October, for instance, nearly a dozen cases of theft of computers and data were reported from OC offices. This occurred days after allegations of financial irregularities against Suresh Kalmadi, the former chief of the committee, and some of his key aides surfaced.

Kalmadi, a Congress MP from Pune, was arrested on Monday and remanded to eight days police custody (See: Kalmadi remanded to 8-days police custody; sacked as IOA president)

More than half a dozen other key aides, including Lalit Bhanot, the former secretary-general of the Commonwealth Games organising committee, and V K Verma, the former director-general of the committee, have already been arrested in the case.

Kaur, a senior government official, was brought to the OC in February, and was the nodal officer coordinating with the various investigative agencies probing into the financial irregularities of the committee. The OC is now trying to retrieve the back-up files. While the OC building is under CCTV surveillance, the CVO's office is not covered by the cameras.

Last year, a junior employee of the pantry was nabbed after CCTV footage revealed he was involved in stealing data from computers.

The CVO and other OC officials have already handed over the bulk of data relating to various irregularities to the investigating agencies. The information technology system at the OC is not tamper-proof and the records have often been pilfered.

Earlier this year, the probe agencies and the K Shunglu committee, which also investigated the irregularities, found it difficult to establish links between Kalmadi and his close lieutenants and the numerous financial irregularities, as they found large-scale tampering of records.

However, with the help of computer and security experts they were able to pin them down.