TORO PARK, Calif. -

UPDATE 8/2/16 3 PM: Cal Fire confirms the cause of the Soberanes Fire was an illegal unattended campfire.

Cal Fire said the campfire was about 2 feet by 2 feet when it started on Friday, July 22 inside Garrapata State Park, about 2 1/4 miles up from Highway 1. As of Tuesday morning, the fire expanded to more than 43,000 acres, 57 homes have been destroyed, one bulldozer operator was killed and containment is at 18 percent.

"Since the beginning of the fire, Cal Fire investigators have spent over 150 hours examining the scene and interviewing witnesses. The origin area was about 2 1/4 miles up Soberanes Creek Trail at the north end of the North Fork Trail. At this point the investigation team has determined that the cause of the Soberanes Fire is an illegal unattended campfire," said Brennen Blue with Cal Fire.

Anyone with information on the fire is asked to call the Cal Fire Hot Line at 1-800-468-4408.

More coverage on the Soberanes Fire:

How to help Soberanes Fire victims

Soberanes Fire: A timeline

Soberanes fire grows to more than 43,000 acres overnight

Third command post established in Big Sur for Soberanes Fire

Soberanes Fire T-shirts on sale outside Toro Park

Crews said the trail leading to the area is a fairly popular location but the fire was off the beaten path.

Cal Fire said two hikers lost in the middle of the fire made it out on their own last Monday, admitting they were working on a 900 marijuana plant grow near the fire. They were not hurt and aren't facing any charges. Their grow was destroyed in the fire.

Last Tuesday, six people were rescued by volunteer firefighters and a bulldozer crew in the Palo Colorado area. Deputies said they were hiking and called for help after getting too close to the fire near Bottcher's Gap. Firefighters later found two bags of pot near the location where the group was rescued.

Officials said the hikers were interviewed and the investigation is ongoing. No one has been arrested and investigators are still looking for more information.

The Monterey County Sheriff's Office and the Monterey County District Attorney's Office said it will assist Cal Fire with its continued investigation into the fire.

PREVIOUS STORY: Cal Fire said it plans to hold a press conference at 3 p.m. Tuesday to discuss the cause of the Soberanes Fire.

The information is being revealed at the incident briefing area at Toro Park.

KION's Matt Sizemore will be there with the very latest. We'll have updates online starting at 3 and more in our newscasts at 5 & 6.