Jalandhar, July 22 -- The police remand of inspector Gurinderjit Singh Nagra, who is behind bars in connection with a corruption and extortion case involving a US-based family, has been extended by one more day, police said on Tuesday.

Nagra, who was arrested on Saturday, was produced in a court in Hoshiarpur's Dasuya after his three-day police custody ended on Tuesday. He was taken through the back door to avoid media glare. He was recently indicted by the Federal Bureau of Investigation (FBI) as part of 'Operation Hard Ball' for allegedly trying to extort $400,000 ( Rs.3.81 crore) from a family based in Los Angeles by threatening to implicate their relatives in Punjab in a murder case.

"The investigation is still on as Nagra, so far, ...