A hacking group known as Dark Overlord breached the servers of London Bridge Plastic Surgery and Aesthetic Centre, a popular plastic surgeon clinic, and stole sensitive information including explicit photos of the practice’s clients, the Daily Beast reported.

The group is threatening to release the photos and correlating information about the patients who underwent the procedures, including pictures of in-progress genitalia and breast enhancement.

Dark Overlord claims it stole multiple terabytes worth of data from the plastic surgeon office, including databases of client information that reveal the name and other details about patrons of the clinic.

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London Bridge Plastic Surgery was likely targeted by the group because it is known for its famous clientele. The office, which describes itself as “one of the leading plastic surgery clinics in the UK,” has been staked out in the past by paparazzi hoping to catch a glimpse of celebrities attending the clinic.

The United Kingdom-based paper the Sun recently reported that TV star Katie Price was spotted at London Bridge Plastic Surgery. Dark Overlord apparently confirmed the celebrity status of at least some of the clients, telling the Daily Beast there are some “royal families” within the stolen database.

Not all clients of London Bridge Plastic Surgery are celebrities though, and may be at risk of being caught in the crossfire as the hackers carry out whatever their plan may be. Dark Overlord is known for its attempts to extort its victims, though no mention of extortion has been made by the group or by the clinic.

London Bridge Plastic Surgery acknowledged the breach in a statement, saying, “We took measures to block the attack immediately in order to protect patient information and we informed the Metropolitan Police who launched an investigation. Regrettably, following investigations by our IT experts and the police, we believe that our security was breached and that data has been stolen. We are still working to establish exactly what data has been compromised.”

The clinic said security and patient confidentiality “has always been of the utmost importance to us,” and it has invested in “market-leading technology to keep our data secure.” It also said that its systems are updated daily in order to protect its systems.

Despite the precautions taken by the company, it was in fact hacked. “We are deeply saddened that our security has been breached,” London Bridge Plastic Surgery said. “We are profoundly sorry for any distress this data breach may cause our patients.”

The company is offering its clients “around the clock” support to answer any concerns they may have about the breach.

Prior to the breach of London Bridge Plastic Surgery, which contains deeply personal and sensitive information from individuals, Dark Overlord was best known for its breaches of production studios and its leaks of stolen TV shows.

Earlier this year, the hackers stole and released episodes of “Steve Harvey’s Funderdome” prior to the show being aired. The group also released episodes of Season 5 of the Netflix original series “Orange is the New Black” after Netflix refused to pay a ransom demand. Dark Overlord claimed in April it had content from a number of networks, including ABC, CBS, IFC, FOX and National Geographic.