On Saturday, a court in the central Hungarian city of Kecskemet, where prosecutors say the truck departed, placed four other suspects under preliminary arrest pending possible indictment in the case. Police have set up a hotline for people who may have information on who was aboard the truck and also are hoping for clues from examining an unspecified number of cellphones found in the vehicle. “One can suspect that this was a Syrian group, or (that there were) a few Syrians,” Burgenland province police chief Hans Peter Doskozil told the Austria Press Agency. Interior ministers Thomas de Maiziere of Germany, Bernard Cazeneuve of France and Theresa May of Britain stressed the need to set up “hot spots” in Greece and Italy by the year’s end to ensure refugees are fingerprinted and registered, allowing authorities to identify quickly those in need of protection. De Maiziere said the EU couldn’t wait until a scheduled gathering of ministers in early October, and Luxembourg, which holds the rotating EU presidency, announced later Sunday that interior and justice ministers will meet in Brussels Sept. 14 to discuss how to “strengthen the European response.”