A strike launched from Gaza on Tuesday killed two Thai workers inside a packaging plant in southern Israel, police said, as Israel and Gaza’s Hamas rulers continued to trade attacks throughout the day.

The projectile attack Tuesday afternoon hit a region in southern Israel, according to the Magen David Adom rescue service. It came as Palestinians across Israel and the occupied territories went on strike in a rare collective action against Israel’s policies.

With the war in Gaza showing no sign of abating and truce efforts apparently stalled, the general strike and expected protests could again widen the conflict after a spasm of communal violence in Israel and protests across the occupied West Bank last week.

Israel’s airstrikes toppled a six-story building that housed bookstores and educational centers used by the Islamic University and other colleges, leaving behind a massive mound of rebar and concrete slabs. Desks, office chairs, books and computer wires could be seen in the debris. Residents sifted through the rubble, searching for their belongings.

Israel warned the building’s residents ahead of time, sending them fleeing into the predawn darkness, and there were no reports of casualties. Israel said it was targeting militants, their tunnels and rocket launchers across the territory.

“The whole street started running, then destruction, an earthquake,” said Jamal Herzallah, a resident of the area. “This whole area was shaking.”