Terming the alleged recruitment scam in West Bengal "systemic fraud", the Supreme Court on Tuesday said authorities were duty-bound to maintain the digitised records pertaining to the appointment of 25,753 teachers and non-teaching staff.

A bench comprising Chief Justice DY Chandrachud and Justices JB Pardiwala and Manoj Misra was hearing a batch of petitions challenging the Calcutta High Court's April 22 decision that invalidated the appointment of 25,753 teachers and non-teaching staff in state-run and state-aided schools of West Bengal.