Militants in Gaza fired rockets into Israel while the Israeli military struck targets in the Palestinian enclave on Sunday, setting off fiery explosions.
A building that was hit by an Israeli strike in Gaza City collapsed.
Dozens of Hamas militants broke out of the blockaded Gaza Strip and into nearby Israeli towns on Saturday, killing dozens and abducting others in an unprecedented surprise early morning attack during a major Jewish holiday.
A stunned Israel launched airstrikes in Gaza, with its prime minister saying the country is now at war with Hamas and vowing to inflict an 'unprecedented price'.