Sent_en: 2zh Investigators say they are currently unsure if the blast was purely accidental, or if foul play was involved, as all efforts were initially focused on attempting to locate survivors.
Sent_yy: 调查人员说，他们目前还不确定爆炸是否纯粹是意外，或者是否与谋杀有关，因为所有的努力最初都集中在寻找幸存者上。