Many angry passengers, some of whom were left waiting inside their planes for up to five hours earlier this week, complained about a lack of communication from the budget carrier. “Certain SpiceJet systems faced an attempted ransomware attack last night that impacted our flight operations,” the airline said on Twitter.

The company added that it had “to a large extent contained and rectified the situation”, but ongoing delays had forced some flights to airports with night curfews to be cancelled.

An airline official on Thursday said that flight operations were back to normal, without sharing details of any investigation into the incident.