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A cyberattack that forced airlines to cancel and postpone flights at several major European airports was caused by ransomware that disrupted the software used to process passenger check-ins, according to a European cybersecurity agency.

The incident, which began Friday, targeted a system called MUSE operated by Cedar Rapids-based Collins Aerospace . The platform underpins check-in, boarding and baggage systems for airlines worldwide. With kiosks and bag-drop machines offline, airports have been forced to rely on manual processing, slowing passenger flows.

The European Union Agency for Cybersecurity, or ENISA, confirmed in a statement Monday that the outage was “caused by a third-party ranso

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