Ajmal Aamir Qasab, the lone terrorist captured in the 26/11 terror attacks on Mumbai, was on Thursday remanded in police custody till December 24 by a court for his alleged involvement in the killing of ATS chief Hemant Karkare and two other senior police officers. Due to security concerns, Ajmal was not produced in a regular court and a magistrate and a public prosecutor were taken to the police lock-up, where the terrorist was lodged.