At least 342 Palestinians have been killed as Israel launched a massive assault on Gaza, shattering the fragile two-month-old ceasefire with Hamas. Hamas, which governs Gaza, said it viewed Israel’s attacks as a unilateral cancellation of the ceasefire that began on January 19. Israel’s Prime Minister Benjamin Netanyahu said he ordered the military to take “strong action” against Hamas over its refusal to release captives taken from Israel or agree to offers to extend the ceasefire.