Israeli airstrikes killed 11 Palestinians in Gaza, including the wife and infant son of Hamas' military leader, Mohammed Deif, in what the group said Wednesday was an attempt to assassinate him after a cease-fire collapsed.

Accusing Israel of opening a "gateway to hell," Hamas fired rockets at Tel Aviv and Jerusalem. The attacks caused no casualties but demonstrated the Islamist movement could still bring the Gaza war to Israel's heartland despite heavy Israeli bombardments in the five-week-old conflict.

Israel's military said it had carried out 60 airstrikes on the Gaza Strip since hostilities resumed on Tuesday, and that Palestinians launched more than 80 rocket salvoes, some intercepted by the Israeli anti-missile Iron Dome system.