Hackers linked to Iran have breached an Israeli internet hosting company, taking down several of its sites. The hackers released some alleged personal information online, including from an LGBT dating site.

“Atraf,” a geo located dating service as well as a nightlife index, is a popular app and website in the Israeli LGBT community, especially in the Tel Aviv area.The hackers said the information leaked online represented just 1 percent of the data acquired in the breach.

The cyberattack also hit websites including of Israeli public transportation companies Dan and Kavim, a children’s museum and public radio’s online blog. The attack also targeted the tourism company Pegasus; and Doctor Ticket, a service that could have sensitive medical data.

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The hacking group known as Black Shadow claimed responsibility for the attack and published what it said was client data, including the names, email addresses and phone numbers of Kavim clients, on the Telegram messaging app.

Hello Again! We have news for you,” the hackers wrote in a message on Telegram on Friday night.“You probably could not connect to many websites today. ‘Cyberserve’ company and their customers hit by us,If you don’t want your data leaked by us, contact us SOON.”

Later another message read: “They did not contact us… so (the) first data is here,” with the group dumping the information online.

The group issued another message claiming to have more data, and posted what it said was information pertaining to clients of the Dan transportation company and a travel agency.

Black Shadow is a group of Iran-linked hackers who use cyberattacks for criminal ends.The group breached Israel’s Shirbit insurance firm in December last year, stealing a trove of data.It demanded a $1 million ransom and began leaking the information when the firm refused to pay.

The new attack comes after an unprecedented, unclaimed cyberattack wrought havoc on Iran’s gas distribution system this week.

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Iran and Israel have been engaged in a so-called “shadow war,” including several reported attacks on Israeli and Iranian ships that the two have blamed on each other, as well as cyberattacks.

In 2010 the Stuxnet virus believed to have been engineered by Israel and its ally the US infected Iran’s nuclear program, causing a series of breakdowns in centrifuges used to enrich uranium.