Task: Translation
Input (Japanese): 捜査員によれば、最初は生存者の発見に全力が尽くされたので、爆発が純粋に事故なのか、それとも不法行為があったのか現在のところ不確かである。
Output (English): 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.