Palestinian militants in the Gaza Strip fired at least 100 rockets into southern Israel on Saturday, according to the Israeli military.

The attack triggered retaliatory airstrikes and tank fire against militant targets in the blockaded enclave and shattered a month-long lull in violence.

Gaza’s Health Ministry said a 22-year-old Palestinian, Emad Nassir, was killed by an Israeli airstrike. Six other Palestinians sustained injuries from airstrikes and shelling. In Israel, there were no reports of injuries, and police said a house in the coastal city of Ashkelon was damaged.

The outbreak of fighting came as leaders from Hamas, the militant group that controls Gaza, and the smaller armed faction Islamic Jihad were in Egypt for talks with mediators aimed at restoring a fraying cease-fire.

Hamas leaders have hoped the recent calm would pave the way for a deeper, longer-term cease-fire.

The Israeli military said dozens of rockets were intercepted by its Iron Dome rocket-defense system, and that roads near the Gaza border were closed to civilian traffic. Israeli police said they had dispatched bomb disposal experts to the country’s south to deal with projectiles that landed in open areas.

The army said its chief of staff, Lt. Gen. Aviv Kochavi, convened an emergency session with top security officials to discuss the situation.

The European Union’s ambassador to Israel, Emanuele Giaufret, sharply criticized the rocket attacks on Twitter, saying “firing indiscriminately against civilians (is) unacceptable.”