HPD said there were more than 500 officers throughout the day, about 300 of which were active during the incident.

休斯顿警察局表示，全天有500多名警察，其中约300人在事件发生期间仍然很活跃。

By 9: 38pm, that event had turned into a mass casualty event according to HPD with one officer describing that there were multiple people on the ground in cardiac arrest, needing medical attention.

休斯顿警局表示，到了晚上9：38，这一事件已经演变成大规模伤亡事件，另有一名官员描述说，地面上有多人心脏骤停，需要医疗救治。