Khalistan Liberation Force chief Harminder Singh Mintoo being produced at Patiala House Court in New Delhi. Pic/PTI

New Delhi: Khalistani Liberation Force (KLF) chief Harminder Singh Mintoo, who was arrested after he escaped from Nabha jail, was yesterday sent to seven days' police custody by a Delhi Court which noted that “custodial interrogation” of the accused was required to unearth conspiracy in the jailbreak case.