Hackers targeted the website of an Israeli newspaper on Monday, the anniversary of the 2020 killing of a top Iranian general, replacing its content with an image threatening a site associated with Israel's undeclared nuclear weapons program.
No group immediately claimed responsibility for the hacking.
The image posted on the Jerusalem Post's website depicts a missile coming down from a fist bearing a ring long associated with Qassem Soleimani, the Iranian general killed by a U.S. drone strike in Iraq two years ago.
It also shows an exploding target from a recent Iranian military drill designed to look like the Shimon Peres Negev Nuclear Research Center near the city of Dimona.
The facility is already home to decades-old underground laboratories that reprocess the reactor's spent rods to obtain weapons-grade plutonium for Israel's nuclear bomb program.
Under its policy of nuclear ambiguity, Israel neither confirms nor denies having atomic weapons.
In a tweet, the Jerusalem Post acknowledged being the target of hackers. It later restored its website.