GAZA CITY, Gaza Strip—A strike launched from Gaza killed two Thai workers inside a packaging plant in southern Israel on Tuesday, police said, hours after Israeli airstrikes toppled a six-story building in the Palestinian territory. With the war between Israel and Gaza’s Hamas rulers showing no sign of abating and truce efforts apparently stalled, Palestinians across Israel and in the West Bank went on strike in a rare collective action against Israel’s policies. The general strike could further widen the conflict after a spasm of communal violence in Israel and protests across the West Bank last week. Roads leading out of Palestinian towns were blocked in the morning to prevent those who wanted to go to work from leaving. Since the fighting began last week, the Israeli military has launched hundreds of airstrikes it says are targeting Hamas’ militant infrastructure, while Palestinian militants have fired more than 3,400 rockets from …