SACRAMENTO, Calif. (KTXL) — A 3-year-old boy died in a residential fire in an Arden-Arcade neighborhood Thursday morning, according to Metropolitan Fire of Sacramento.

The fire occurred in a four-plex residential unit on Carro Drive in Arden-Arcade just before 10:00 am, according to Metro Fire.

According to Sacramento County Sheriff’s Office, a 3-year-old boy and a 5-year-old child were possibly playing with a lighter while their father was outside.

“My understanding is that a 3-year-old and a 5-year-old were inside. They might have had access to a lighter, and that’s perhaps how the fire started that the parent was outside of the structure,” Sgt. Rod Grassmann said.

When the father was alerted to the fire, he was only able to save the 5-year-old, and the 3-year-old died in the fire, according to Metro Fire.

The father was transported to the hospital for his injuries, the mother was transported due to emotional distress and the 5-year-old accompanied them as a precaution, Metro Fire said.

Fire officials said all three were sent to UC Davis Medical Center.

The sheriff’s office said it is investigating the fire.

“We’re looking to see if there’s any sort of criminal neglect component to the unfortunate fatality of a 3-year-old boy,” Grassmann said.

Metro fire told FOX40  a total of 12 people lived inside the four-plex. All of them were displaced now and the Red Cross is helping them find a place to stay.