3 people, including 3-year-old girl, critically hurt in fire and possible explosion at Detroit apartment building

A cause is not known, officials said.

Three people, including a 3-year-old girl, were critically hurt in a fire and possible explosion at an apartment building in Detroit, officials said.

The fire was reported around 4 a.m. Monday. When crews arrived, they found people "hanging off" windows, "ready to jump" from the 12-unit building, Detroit Executive Fire Commissioner Chuck Simms told reporters.

"Firefighters immediately went into action" and rescued everyone from the building, including six children, Simms said.

Thirteen people were taken to hospitals, the fire department said.

Three people who were in the same apartment were hospitalized in critical condition: a man with severe burns to 90% of his body; a woman with severe burns to about 20% to 40% of her body; and a 3-year-old girl who suffered burns to 15% of her body, Simms said.

The other injured victims were hospitalized in stable condition, including a mom and her four children, Simms said. He described their injuries as "scrapes and bruises."

A cause is not known, Simms said. The investigation is focused on the apartment where the three victims suffered serious burn injuries, he said.