KHAN YOUNIS, Gaza Strip (AP) — Israel’s war with Hamas resumed after a weeklong truce expired, with each side blaming the other for the resurgence of hostilities. Israeli airstrikes hit houses and buildings in the Gaza Strip, while militants in Gaza fired rockets into Israel. Health authorities in the besieged territory report dozens of Palestinians were killed Friday. Israel dropped leaflets over Gaza City and southern parts of the enclave, urging civilians to flee to avoid the fighting. The fighting threatens to compound the suffering in Gaza and has heightened concerns for hostages still held captive by Hamas and other militants.