Fire officials are still trying to figure out what exactly started the Brooklyn blaze that killed two young girls and sent two others to the hospital Saturday. In the meantime, we’re still waiting for officials to identify the victims, as we learn more about the fire that took their lives.

The girls who died were 8-years-old, and the other just 7-years-old.

The first 911 call came in just before 11 p.m. Saturday night. According to officials, the fire occurred on the second floor of a 3-story building along Schafer Street near the intersection of Central Avenue.

Some of the nearly 100 firefighters who responded to the 2-alarm blaze did not have to travel far, as there is a firehouse just feet away from the where the fire broke out.

While crews were able to pull a total of four people from the building, the two girls were pronounced dead at the hospital.

Fire investigators returned to the scene Sunday morning. They sifted through the charred remains of the apartment, where authorities say the girls had been visiting their 53-year-old grandfather. He and a 68-year-old man were the two others rescued from the building. Both were hospitalized, and suffered from smoke inhalation. Both are expected to survive.

The medical examiner will determine a cause of death for the two girls killed in the fire, but officials say they don’t expect a ruling for several days.