FREMONT, Neb. (AP) — The remains of two girls and a relative who were killed in a massive explosion at a Nebraska biofuel plant were recovered Wednesday after crews battled smoldering wreckage and an unstable building for more than 24 hours.

Two children and an adult man when an explosion tore through a Horizon Biofuels facility in Fremont, Nebraska. A fire is still raging.

Officials said the children were waiting for the adult, a plant employee, to finish work before heading to a doctor’s appointment.