Their crowd-control system “collapsed”, said North Rhine-Westphalia’s interior minister.
他们的人群管理系统“崩溃”了,North Rhine-Westphalia的内务大臣说。
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Both he and Peter Waddington, a former policeman and now an authority on crowdcontrol at Wolverhampton University, are sceptical about plastic bullets (or baton rounds as the police call them).