International aid groups said on Thursday there is nothing more they can do to protect staff in the Gaza Strip and that it is up to Israel to avoid killing them as the United Nations appealed for direct humanitarian coordination with the Israeli military. Global outrage at the humanitarian crisis in the Palestinian enclave of 2.3 million people escalated after an Israeli strike on Monday killed seven people working for US-based food charity World Central Kitchen (WCK). The UN says at least 196 humanitarian workers have now been killed in the six-month-long Gaza war. While some aid groups have …