Picture showed another plume of smoke rising from the second blast down the road.

画面显示，这条道路不远处第二个爆炸地点又燃起浓烟。

Within minutes, a superheated cloud of gas and debris blasted down the mountain at supersonic speed, devastating nearly 250 square miles of forest.

几分钟内，一团过热的气体和碎片云以超音速从山上轰下，摧毁了近 250 平方英里的森林。