An unpermitted anti-capitalist protest march towards the G20 summit in Pittsburgh has turned violent today, with police firing tear gas after protesters barricaded the street. Quelle: http://feeds.timesonline.co.uk/c/32313/f/440134/s/64d0dd9/l/0L0Stimesonline0O0Ctol0Cnews0Cworld0Cus0Iand0Iamericas0Carticle68481760Bece0Tcid0FOTC0ERSS0Gattr0F20A15164/story01.htm