Israeli warplanes have struck around 100 Hamas targets in the Gaza Strip in response to a rare rocket attack on the Israeli metropolis of Tel Aviv.
Rocket fire persisted, setting the stage for additional possible reprisals.
The Israeli army said that its targets had included an office complex in Gaza City used to plan and command Hamas militant activities, an underground complex that served as Hamas' main rocket-manufacturing site, and a centre used for Hamas drone development. There were no reports of casualties.
The late-night attack on Tel Aviv, Israel's densely populated commercial and cultural capital, marked a dramatic escalation in hostilities. It was the first time the city had been targeted since a 2014 war between Israel and Gaza militants.
Hamas denied responsibility for the initial rocket attack, saying it went against Palestinian interests. But Israel said that, after a preliminary investigation, it had concluded that the militant group was behind the attack.