"We have a very strange explanation coming from the Government authorities at the highest level of the CBI purportedly stating that they issued a Lookout Notice by an error. It's not a child's play and they are not casually issued or revoked," party spokesman Abhishek Singhvi told reporters here.
Noting that such notices are not limited to national boundaries, he said it goes beyond and has connectivity with Interpol rules and are circulated across the world.
Insisting that such explanations raise many questions than answers, he said, "it would be comic, if not tragic that such mysterious, strange explanations are trotted out."
"The bottom line is, under the cynosure of press, court proceedings, notices and orders, a person is allowed to depart. A cover-up excuse is trotted out that there was a defective Lookout Notice", he said.
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Besides, he said it's also equally very well known that when banks attached Mallya's valuable properties in Goa, then the CM of Goa and the Government of Goa intervened and stopped the process.
"In that comes the very strange pretext of a cover-up about departure on the basis of incorrect or illegal lookout notice and the totality of such circumstances raise serious question marks", he said.
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Meanwhile, another senior Congress leader, Ghulam Nabi Azad, also hit out at NDA Government for its alleged involvement in "sending" Mallya abroad and insisted that CBI issued second notice in connection with Mallya episode under "Centre's influence".
Azad said CBI had on October 16 last year issued a Lookout notice which, he said, stated that Mallya not be allowed to go abroad and be detained.
This notice, the Rajya Sabha Opposition Leader said, was "changed in a month".