A policeman stands in front of a door of a train ready to go to Munich, Germany, as he blocks migrants without the proper documentation from getting on it, at Brenner railway station, Italy May 28, 2015. Some 200 mostly Eritrean migrants heading northwards from Italy were turned back by police in the Italian Alps on Friday and left sleeping in train stations as European countries tightened frontier checks before a global summit in Germany. Picture taken May 28, 2015. REUTERS/Stefano Rellandini