Israel’s war with Hamas erupted again Friday, as airstrikes hit houses and buildings in the Gaza Strip minutes after a weeklong truce expired. Health authorities in the besieged territory reported dozens of Palestinians killed and Israel dropped leaflets over Gaza City and southern parts of the enclave, urging civilians to flee to avoid the fighting. Militants in Gaza resumed firing rockets into Israel, and fighting broke out between Israel and Hezbollah militants operating along its northern border with Lebanon. The resumption of the war threatens to compound the suffering in Gaza. Some 2 million people -- almost its entire population -- are crammed into the territory's south, where Israel urged people to relocate at the war's start and has since vowed to extend its ground assault. Unable to go into north Gaza or neighboring Egypt, their only escape is to move around within the 85-square-mile area (220 square kilometers). Renewed hostilities also heighten concerns for about 140 hostages still held captive by Hamas and other militants, after more than 100 were freed during the truce. For families of remaining hostages, the truce’s collapse was a blow to hopes their loved ones could be the next out after days of seeing others freed. Israel said Friday its troops found the bodies of four more hostages in Gaza, bringing the total known dead to seven. As Israeli airstrikes on Gaza resume following and end to a weeklong truce with Hamas, FRANCE 24's François Picard is joined by Douglas J. Feith, Senior Fellow at the Hudson Institute writing and lecturing on such topics as terrorism, arms control, alliance relations, national security policy making and the relationship of policy and intelligence.