KHAN YOUNIS, Gaza Strip (AP) — Israel’s defense minister told ground troops to be ready to enter the Gaza Strip, though he didn’t say when the invasion will start. Israeli airstrikes have pounded locations across the Gaza Strip, including parts of the south that Israel had declared as safe zones. The attacks on Thursday have heightened fears among more than 2 million Palestinians trapped in the territory that nowhere was safe. With authorities working out logistics for a delivery of aid from Egypt, overwhelmed hospitals tried to stretch out ebbing medical supplies and fuel for diesel generators to keep their equipment running.