The Czech president, Miloš Zeman, has warned of a “super-holocaust” leaving hundreds of millions dead if Islamic State is not stopped. Speaking in Prague at a conference marking the 70th anniversary of the liberation of Auschwitz, Mr. Zeman said Islamic State was similar in nature to Germany's Nazis at the start of the 1930s. He called for unified armed action against Islamic State led by the United Nations Security Council and warned that more terrorist attacks would need to occur before the public realised that it wasn't possible to negotiate with terrorists.