He offered protesters vinegar to put on their bandanas .

他向抗议者提供食醋，抹在头巾上。

Suddenly , several men masked in bandanas open fire on the party .

突然之间，几个以方巾蒙面的男人闯进派对开枪。

A contingent of young protestors with bandanas over their faces began throwing bottles and chunks of concrete at the police .

一群用头巾包脸的年轻示威者开始向警察投掷瓶子和水泥块。