An Israeli webcast of the first Eurovision semi-final has been hacked to show faked explosions in host city Tel Aviv, ONA reports citing BBC.
Viewers saw a warning about a fictitious attack on the city, accompanied by an animated video and the sound of air raid sirens.
The Israeli national broadcaster, Kan, blamed Hamas for the interruption, though the Palestinian militant group has not commented.
The TV broadcast was not affected.
Viewers tuning in to the Kan webcast saw the warning: "Risk of missile attack. Please take shelter," under a fake logo of the Israeli army and the sound of a rocket-warning siren.
Aerial images showed simulated explosions at sites near the Eurovision venue and the warning: "Israel is not safe. You will see."