Aid deliveries have begun moving into the besieged Gaza Strip, two weeks after the militant group Hamas rampaged through southern Israel and Israel responded with airstrikes. Separately, Israel said Hamas freed two American hostages who had been held in Gaza. Israeli airstrikes have continued in southern Gaza, an area swelled by civilians who fled there from the north on Israeli instructions. Israel is also evacuating a sizable town near the Lebanese border in the latest sign of a potential ground invasion of Gaza.