Bihar Police chief Neelmani said it was a matter of investigation as to who issued the passport, who verified the address and how Khan managed to get it re-issued.

Neelmani said all aspects of this high-profile case would be looked into by the police.

"It is a matter of surprise that the address on which Hasan Ali Khan was issued passport in 1997 is of a general nature, with no specific details," he said.

On Thursday, the case of a passport issued to Hasan on a fake address in Patna came to light.

Patna Senior Superintendent of Police (SSP) Alok Kumar said a regional passport officer at Patna had lodged a first information report (FIR) Dec 19 last year against Khan for cheating and forgery for submission of fake residential proof while applying for a passport.

Khan, in his passport application, had given Pathantoli locality under Alamganj police station in Patna as his local address and Belsand village in Bihar's Sitamarhi district as the permanent address, he said.

Khan is said to have stashed away $8 billion (Rs.36,000 crore) abroad and is allegedly India's biggest tax defaulter.