The information came as further embarrassment to the agency which has been accused of going soft on Mallya, facing a CBI probe for defaulting on repayment of a loan of Rs 900 crore taken from IDBI.

Sources said, in its October 16, 2015 request to issue a lookout circular, CBI had said if Mallya tries to leave the country, he should be detained at the exit point. Nearly a month later in November, the agency asked for a revised circular where it asked the Bureau of Immigration to inform it about his departure and travel plans.

The sources said Mallya travelled abroad in October and returned in November, while he made two trips in first and last week of December and also a trip in January besides the recent trip reportedly to London on March 2.

The lookout circular depends on the issuing authority and, unless they ask BoI to detain a person or to stop him from boarding a plane, no action is taken.

The sources said after CBI changed the lookout notice, BoI did not make any attempt to stop him from travelling abroad and every time he travelled the agency was duly informed about it.

CBI had registered a case against Mallya, KingfisheAirlines, Chief Financial Officer of the airlines A Raghunathan, and unknown officials of IDBI Bank in its FIR alleging that Rs 900 crore IDBI loan was sanctioned in violation of norms regarding credit limits on the basis of complaint received from the bank.

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