2016 2.14 million people move germany 2015 46 per cent increase 2014.it come surprise less one month horrific terror attack ariana grande concert uk one big music festivals germany shut concrete terror threat.rock ring cancel open night thousands festival-goers tell leave site rburg calm control manner .some 92,500 three-day ticket sell festival due run friday sunday.the dpa news agency report festival clear open night koblenz police say receive information concrete threat .the cancellation announce rock ring facebook page.a spokesman say due terrorist threat police advise us interrupt festival ask festival visitors leave festival site calm control manner towards exit camp ground support police investigations via daily mail new normal massive music festival angela merkel islamic migrant nation germany evacuate concrete terror threat video