BALTIMORE (AP) — The city of Baltimore and federal authorities are investigating whether documents posted online are connected to a ransomware attack that has hobbled the city’s computer network.

A mayor’s office spokesman, Lester Davis, tells The Baltimore Sun that there’s currently no evidence personal data has been was breached in the May attack.

However, a Twitter account claimed to be run by the attackers posted city material and faxes, including a detailed assessment of a woman’s medical history. And before Twitter suspended the account on Monday, someone used it to direct message the Sun, threatening to post more financial documents and personal information on the “darknet.”

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City officials have refused a demand to pay the equivalent of $76,000 in bitcoin in response to the attack, which used a ransomware variant called RobbinHood.

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Information from: The Baltimore Sun, http://www.baltimoresun.com