The San Francisco Municipal Transportation Agency said late Monday that no data had been accessed from its servers in a ransomware attack on the Muni transit system and the agency has never considered paying the ransom asked by the attacker.

The statement by the SFMTA follows reports that the alleged attacker has threatened to dump 30GB of data stolen from the agency if the ransom of the equivalent of about $73,000 in bitcoin was not paid.

“The SFMTA network was not breached from the outside, nor did hackers gain entry through our firewalls,” the agency’s spokeswoman Kristen Holland wrote in a blog post. She did not mention how the ransomware had gotten to the SFMTA systems, though there is the possibility that it may have been activated through a link in an email or a web link by an unsuspecting insider.

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