At least seven people were killed and a further 22 injured in an Israeli air attack on Khan Younis in the southern Gaza Strip, a staff member of the European Hospital in the city reported on Monday. A spokesman for the Israel Defense Forces (IDF) said the report was being investigated. Reports from residents of the city said that those killed had been escorting humanitarian aid on the orders of the Palestinian militant movement Hamas. There have been increased reports of looting of aid by civilians in the Gaza Strip, amid warnings from aid organizations that public order is breaking down. US S…