 Striking U.N. facilities is prohibited under international law. But Israel argues that Hamas' use of those facilities also violates international law and makes them a legitimate target. Meanwhile, hundreds of thousands of Palestinians are caught in the middle, trying desperately to find shelter. Last week, an Israeli airstrike hit next to a U.N. school in the city of Khan Yunis. Ahmed Akramzakzouk was staying in the schoolyard with his children. You know, it's like you've been there before. You know, someone comes and warns you.