A brush fire on Lookout Mountain west of Denver Friday night was caused by fireworks, investigators said on Sunday.

The fire was reported around 9 p.m. near the Tiers of Zion trailhead, according to Foothills Fire and Rescue, which called Genesee Fire and Golden Fire for help.

Crews from the three agencies extinguished the fire by midnight, and then Foothills Fire launched an investigation, stating on Sunday that fireworks had caused the fire.

"We're grateful for the swift and professional response from all departments involved," the department said on social media. "This incident serves as a strong reminder of the importance of fire restrictions and the risks fireworks pose in our wildland areas-especially during dry conditions."

No one has been arrested or cited as a result of the fire. A spokesman for the Jefferson County Sheriff's Office said the fire was near a section of road inside a gated area and an investigation is ongoing.