.................... (KRON) -- Powerlines and fireworks are being probed by Cal Fire investigators to pinpoint sources of ignition that sparked the deadly Eaton Fire and Palisades Fire in Los Angeles County. Once flames lit on January 7, a windstorm gusting up to 100-mph fanned fires that torched entire neighborhoods. The destructive infernos spread so rapidly that dozens of victims were unable to escape in time. Cal Fire officials have not released official causes behind either wildfire. This week, however, investigators were seen zeroing-in on locations where the Eaton Fire and Palisades Fire originated. The first wildfire that ignited on January 7 was the Palisades Fire, which was reported at 10:30 a.m. A video on X shows a group of hikers running for their lives as a brush fire spread from Skull Rock hiking trail down mountain slope. Skull Rock hiking trail is a popular loop above the Palisades-Highland community with sweeping views of the Pacific Ocean. A helicopter aerial view shows the Palisades Fire's smoke plume rising above the San Fernando Valley on Jan. 11, 2025. (Myung J. Chun / Los Angeles Times via Getty Images) Videos posted on social media show a group of young men hiking when they smell smoke, realize that a fire is rapidly spreading toward them, and they immediately decide to run. After they ran a ways down the trail, one man in the group turned around to see a column of black smoke rising, and said, "Dude, that’s right where we were standing." Within 24 hours, the brush fire grew into the costliest wildfire in Los Angeles history as it wiped out thousands of homes and spread over 23,713 acres. On Monday, aerial footage of the area captured by KTLA's Sky5 news helicopter showed more than a dozen investigators combing the area looking for clues in the burn scar by Skull Rock. Scorched structures are seen on January 12, 2025 in Los Angeles. (Photo by Qian Weizhong /VCG via Getty Images) Seven days before the Palisades Fire, New Year's Eve fireworks ignited a small brush fire at Skull Rock before it was doused by firefighters, according to the Los Angeles Times. Investigators are likely looking into whether embers from the small fireworks fire rekindled when the windstorm hit on Tuesday with hurricane-force, KTLA reported. Power lines are also being closely looked at as possible sources of the Palisade Fire, according to KTLA. Altadena Church was destroyed by the Eaton Fire. (Photo by Tayfun Coskun /Anadolu via Getty Images)   Investigators are still considering an array of possible ignition sources. There were no reports of lightning in the Palisades area or the terrain around the Eaton Fire. The Eaton Fire near Pasadena likely originated at an electrical transmission tower in Eaton Canyon, according to a slew of lawsuits filed against the utility company that operates the tower. The suits were filed on behalf of some Altadena residents whose homes were destroyed. The Eaton Fire began on January 7 at 6:18 p.m., Cal Fire said. Local residents recorded the first flames leaping from the tower's base below electrical transmission lines, images included in the lawsuits show. Altadena, CA - January 08: The remains of a home lost in the Eaton fire on Wednesday, Jan. 8, 2025 in Altadena, CA. (Jason Armond / Los Angeles Times via Getty Images) The tower is owned by Southern California Edison. The utility said it does not believe its equipment sparked the blaze, partially because the site had no "electrical or operational anomalies" until after the Eaton Fire was already raging. "To date, no fire agency has suggested that SCE’s electric facilities were involved in the ignition," Southern California Edison wrote. At 6:15 p.m. on January 7, two Altadena residents "observed the ignition of the Eaton Fire underneath an electrical tower across the canyon from their home," one lawsuit filed by Bridgford Law firm states. Before evacuating, the duo snapped the images below. (Photos by Jennifer Errico and Marcus Errico via Bridgford Law) Gabriela Ornelas, an Edison spokesperson, said, "Our hearts remain with our communities during the devastating fires in Southern California, and we remain committed to supporting them through this difficult time." The two wildfires are still burning dry landscape Tuesday. Cal Fire officials said firefighters have achieved 17% containment for the Palisades Fire, and 35% containment for the Eaton Fire. There is no rain in the forecast, and Los Angeles has not had any significant rain over the past eight months. John Lentini, owner of Scientific Fire Analysis, said, "It’s going to go out when it runs out of fuel, or when the weather stops. They’re not going to put that thing out until it’s ready to go out." The Associated Press contributed to this report.