San Francisco’s Muni transit system was reportedly hit by ransomware on Friday, leading to the message “You Hacked, ALL Data Encrypted” being displayed on the computer screens at stations, according to newspaper reports.

The message said that cryptom27 at yandex.com should be contacted for the key to unlock the data.

Fare payment machines at stations also displayed that they were “out of service,” and San Francisco’s Municipal Railway, widely known as Muni, was allowing free rides on its light-rail vehicles as it was unable to charge customers, according to the San Francisco Examiner.

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