Israel bombed dozens of targets in Gaza on Monday and said that while it was prepared to step up its offensive by sending in troops, it preferred a diplomatic solution that would end Palestinian rocket fire from the enclave.
Mediator Egypt said a deal for a truce to end the fighting could be close. The leader of Hamas said it was up to Israel to end the new conflict it had started. Israel says its strikes are to halt Palestinian missile attacks.
Twelve Palestinian civilians and four fighters were killed in the air strikes, bringing the Gaza death toll since fighting began on Wednesday to 90, more than half of them non-combatants, local officials said. Three Israeli civilians have been killed.
After an overnight lull, militants in the Hamas-run Gaza Strip fired 45 rockets at southern Israel, causing no casualties, police said. One damaged a school, but it was closed at the time.
Among targets struck in Gaza on Monday, Israeli missiles blasted a tower block housing international media for the second straight day. One person was killed there, described by a source in militant groups Islamic Jihad as one of its fighters.