The investigation is critical for not only understanding what happened, but for ensuring it never happens again, said an attorney for 300 Altadena residents.

As the Eaton fire spread, many areas were notified of evacuation warnings and orders well in advance. In the heart of Altadena, where all 17 reported deaths occurred, evacuation orders came hours after fire did.

All of the 17 deaths confirmed in the Eaton Fire occurred in an area where an evacuation order was delayed for hours after the blaze erupted, according to a Los Angeles Times report.

Palisades Fire initially started 10:30 a.m. Jan. 7 in Los Angeles County. It has burned 23,713 acres after being active for 13 days. A crew of 5,175 firefighters has been working on site and they managed to contain 59% of the fire by Monday morning. The blaze's cause remains under investigation.

The massive Palisades Fire broke out in Los Angeles on Tuesday afternoon, prompting mandatory evacuations affecting tens of thousands of people and highway closures. Later Tuesday, the Eaton Fire broke out in the foothills of Pasadena on the other side of Los Angeles County.