Russian-speaking ransomware gang BlackCat is leaking data stolen from a Pennsylvania-based healthcare group, including photos of breast cancer patients.

On Saturday, the ransomware group posted on its dark leak site a message taunting Lehigh Valley Health Network. “We have been in your network a long time and have had time to study your business,” the group wrote. “We have stolen you confidential information and are ready to publish it.”

Images posted by the criminal gang include screenshots of patient diagnoses of a handful of patients and pictures of breast cancer patients disrobed from the waist up.