Israeli military jets targeted sites linked to Palestinian Islamic Jihad in the Gaza Strip, hours after militants from the group fired more than 20 rockets into Israeli territory.
The exchange came after a Palestinian news agency posted graphic footage showing an Israeli Army bulldozer dragging the body of a Palestinian man - who Israel said was part of a "terror squad" - who was killed as he placed an explosive device along the border fence.
The sudden flare-up followed weeks of relative quiet as Egypt attempts to broker a long-term truce between Israel and Hamas, the militant Islamist faction that rules the Gaza Strip. Israel and Hamas have fought three wars in the past decade, and there have been many other flare-ups in violence.
It also comes a week before Israelis return to the polls for a third general election in less than a year. Prime Minister Benjamin Netanyahu's handling of the long-running Gaza situation came under sharp criticism over the weekend.
The Israeli military said more than 20 projectiles and rockets were fired from Gaza today. Most were intercepted by the Iron Dome aerial defence system. Videos shared on social media showed civilians in the cities of Ashkelon and Sderot crouching for cover as warning sirens blared in most of the Israeli communities that surround Gaza.