Columbia University on edge as talks collapse over Gaza protests

Police arrested around 275 people on four separate campuses in the United States over the weekend, with the White House calling on the growing protests in recent weeks to remain peaceful. Columbia University said Monday that many Jewish students have left its campus and it demanded that the protestors' encampment must be cleared, adding that Columbia would not divest financial holdings linked to Israel -- a key demand of demonstrators. Students pushed back, vowing to defend their camp on the New York institution's main lawn...