Updated Monday 12:57 p.m.
The Federal Aviation Administration confirmed that four people died in the plane crash that caused a small wildfire Sunday morning.
The Cessna T337G plane is registered to a company in Broomfield. Investigators have not determined why it crashed. The multi-engine plane had one pilot and three passengers aboard.
Our original story continues below.
Evacuation warnings have expired for two small towns in mountainous Boulder County after a small plane crashed and sparked a wildfire Sunday morning.
Officials say the threat of growth has passed, but crews will continue to extinguish hot spots in the area.