在电视直播的武装冲突中，有一小组示威者向即将举办世界杯的巴西国家体育场逼近，防暴警察向他们投放了催泪弹。
In clashes broadcast live on television , riot police fired tear gas into small pockets of protesters as they approached Brasilia 's new stadium that will host Cup matches .
巴西国家体育场