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Officials said the fire was reported at around 1:30 a.m. in the 100 block of Moss Street. Six people were inside the home when the fire broke out.

The residents, some who were trapped inside, tried to call for help, but their phone line went dead.

At least two were able to get out by crawling through the windows. Others were also able to get out.

"They had to break some windows ... and get out through windows, so they did have some lacerations," said Jeff Peter, a battalion chief with the Chula Vista Fire Department. "They'll be OK. Fortunately, they were about to get out of the home on their own."

At least five engines responded to the scene and firefighters were able to knock out the flames within 15 minutes.

Fire investigators, who were still at the scene as of 7 a.m., are now looking into what caused the blaze.

Neighbors said the house is an independent living facility and the people who live there have some sort of mental illness.

10News will update this story as more information becomes available.