The meeting brought together workers from the auto, logistics, healthcare and other industries to discuss how to organize a working class counteroffensive internationally against the attacks on jobs.
Police have said a man attacked them with a burning liquid during a routine check on Thursday. German media has also reported that a second body had been found at the scene.
Düsseldorf: Polizei und Ordnungsamt erwarten ein „heißes Wochenende / Aktuelles / Düsseldorf / report-d de report-d.de - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from report-d.de Daily Mail and Mail on Sunday newspapers.