GAZA CITY, Gaza Strip (AP) — Israeli aircraft struck crowded areas in the Gaza Strip and killed a senior militant with a missile strike on a media center Monday, driving up the Palestinian death toll to 100, as Israel broadened its targets in the 6-day-old offensive meant to quell Hamas rocket fire on Israel.

Escalating its bombing campaign over the weekend, Israel began attacking homes of activists in Hamas, the Islamic militant group that rules Gaza. These attacks have led to a sharp spike in civilian casualties, killing 24 civilians in just under two days and doubling the number of civilians killed in the conflict, a Gaza health official said.

The rising toll came as Egyptian-led efforts to mediate a cease-fire between Israel and Hamas got into gear.