The bench headed by Chief Justice G Rohini also took note of allegations of receipt of unaccounted money to the tune of nearly Rs 5 crores by the chief minister and filing of revised Income Tax returns for years 2009-10, 2010-11 and 2011-12 by him.
The revised IT returns showed an increase in agricultural income to the tune of Rs 6.10 crore, a PIL, filed by NGO 'Common Cause', claimed.
"Meanwhile, the Income Tax department shall file before the court the tax assessment records and other documents of Respondent no.5 (Singh)," the bench, also comprising Justice Jayant Nath, said.
The ASG was responding to the submissions made by Prashant Bhushan, who is representing the NGO, that an undue delay has been caused by the agency in registering an FIR despite the fact that there is sufficient material to prosecute Singh.
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Only the CBI can say about the exact status of the investigation, the ASG said.
Reacting to the Centre's submission, Singh said he has "nothing to fear as I have done no wrong".
Without naming any individual, the Himachal CM said he was being framed in these cases "but I will fight it out".
During the high court proceedings, Bhushan cited a Supreme Court judgement and said the CBI, which had lodged the preliminary enquiry long back, should have completed it within a week. It should have lodged an FIR, he said.
The bench is hearing the PIL alleging that Singh, during his tenure as the Chief Minister and Union Minister, had indulged in corruption, money laundering and forgery.