Welcome back from the weekend! Here's what people will be taking about on Monday. 1. Israel maintains that its forces were not responsible for 16 Palestinians who were killed last Thursday when a United Nations school in Gaza came under fire. An Israeli military spokesman "acknowledged that an errant mortar round fired by Israeli troops had exploded in the school’s courtyard that afternoon," The New York Times reports, "but said the yard had been empty at the time." 2.