A hacker group affiliated with Iran claimed on Wednesday that it had penetrated the systems of Israel’s largest healthcare provider, Clalit, marking what it described as its latest cyberattack targeting Israeli infrastructure.

The group, known as Handala, announced on social media that it had “released the sensitive medical data of more than 10,000 patients from this organization,” The Caspian Post reports, citing The Times of Israel.

It characterized the alleged breach as having “delivered a devastating blow to the core of the Zionist regime’s healthcare system.”

In its online statement, the group mocked Israel’s technological capabilities, writing: “You boast of possessing the most advanced technologies, yet now you helplessly witness the collapse of your security walls,” repeating rhetoric similar to statements it has issued following previous cyberattacks on Israeli entities.

Handala further declared that it viewed the operation as justified, stating: “We proudly declare that our action is a legitimate response to decades of occupation, oppression, and human rights violations by the Zionist regime.”

The post included what appeared to be screenshots of medical records allegedly taken from Clalit’s database. The documents reportedly contained names, personal details, and information related to medical screenings and diagnostic tests of Israeli patients.

According to its official website, Clalit provides healthcare services to approximately 4.8 million people - roughly half of Israel’s population.

Responding to the claims, Clalit said its cybersecurity teams were examining the incident, that relevant government authorities had been notified, and that its systems were continuing to operate as usual.