Police at the Nabha jail after the inmates escaped. Pic/PTI

Patiala: In a sensational jailbreak, the chief of Khalistan Liberation Front militant outfit Harminder Mintoo yesterday escaped along with five other prisoners, after armed men in police uniform stormed the high-security Nabha prison here, exposing “lapses” and raising doubts of possible collusion of insiders, with the Centre seeking an immediate report.