Cause of Boyle Heights warehouse fire believed to be testing conducted by solar contractors: Lineage

A fire at a temperature-controlled storage facility is believed to have started while contractors were conducting testing on a rooftop solar array, the company that operates the site said to Eyewitness News in a statement.

Lineage, the tenant-operator of the building, said they believe the incident began during testing carried out by contractors working for the third-party owner of the solar installation located on the facility's roof.

Lineage believes the fire started while contractors were conducting testing on a rooftop solar array, the company said to Eyewitness News.

The company said that its "top priority is the health and safety of the community" and that it is continuing to coordinate with the Los Angeles Fire Department and other agencies.

"We are grateful to Los Angeles' remarkable firefighters for their ongoing and brave efforts," the company said in a statement.

The facility is primarily used to store frozen food before it is distributed to communities across the greater Los Angeles area and beyond. The company said the building is not used for the storage of hazardous materials.

Officials have not detected dangerous levels of ammonia in the surrounding community, according to Lineage.

"Our understanding from LAFD and AQMD is that there have been no measurable ammonia concentrations recorded in the community since the fire started," the company said.

Lineage added that it has taken precautionary measures to remove ammonia from the site entirely. "Additionally, Lineage has proactively taken additional steps to pump out the ammonia and transport it offsite, removing the possibility of ammonia posing a risk to the community," the statement said.

The company said no employees at the site were injured in the incident.

Lineage said it remains focused on supporting emergency response efforts and ensuring the safety of the surrounding community as the situation continues to be addressed.

LAFD said the cause of the fire remains under investigation.

Crews on Monday continued to make progress on the warehouse fire that's been burning for six days.

The Los Angeles Fire Department says one of the tactics it is using in the firefight is disassembling the sides of the building to get to the center where hot spots and flames are still active.

Crews are using drones and infrared technology to detect those problem areas before attempting to extinguish them.

Crews on Monday continued to make progress on the warehouse fire that's been burning for six days. Here's where the firefight stands.

Smoke conditions have improved, but increases in smoke may happen as crews open walls and other concealed places to locate and extinguish those hidden fires.

"We're seeing a lighter colored smoke now. That means that more ordinary combustibles are burning - cardboard, food products, etc. It's not the actual structure," said LAFD spokesperson Jacob Raabe. "You see that dark, black smoke, that's when the solar panels, when the petroleum products were burning. It's very dark, thick, black smoke. We're hoping not to see a trend that way as far as the smoke."

New video is offering a closer look at the ongoing firefight in Boyle Heights.

The footage shows the pilot's perspective from inside a Los Angeles Fire Department helicopter as crews drop water. The images highlight the scale of the incident, including a massive smoke cloud visible from a significant distance.

The footage shows the pilot's perspective from inside a Los Angeles Fire Department helicopter as crews drop water. The images highlight the scale of the incident, including a massive smoke cloud visible from a significant distance.

"Day 4 of this around-the-clock firefight!" read the Instagram post. "Huge respect to the ground crews down below and Helitac crew-they are doing an absolutely incredible job."

More help is on the way after a state of emergency was declared for the warehouse fire in Boyle Heights.

The fire is still actively burning Monday morning, but more state resources are expected to arrive throughout the day.

Crews have been working around the clock, tearing down walls and using massive helicopters for water drops.

Firefighters warn smoke could still spike as they open up hidden spaces.