More than a dozen websites were attacked on Thursday by anti-Israel hackers.
They posted a video about the destruction of Israel, replacing the affected sites’ normal content.
According to DPA, Israeli media reported that the hacked sites were showing a video with the message: “The countdown of Israel destruction has begun since a long time ago”.
The message, written in Hebrew and English, was accompanied by images of what appeared to be a destroyed Tel Aviv.
Israeli web company, UPress in a statement, said the deliberate attack targeted multiple sites it was hosting.
The firm added that it was working with Israel’s National Cyber Directorate to conduct an investigation.
The directorate had issued a warning about cyber attacks ahead of Al-Quds Day.
Al-Quds Day is marked every last Friday of Ramadan as Iran traditionally protests Israel’s 1967 annexation of East Jerusalem.
However, the Washington Post has reported that Israel was allegedly behind a cyber attack that halted traffic at an Iranian port.
The American newspaper claimed that the attack was reportedly in response to an Iranian attempt in April to hack into Israeli water distribution systems.