The two people charged with starting the Lake Christine Fire pleaded not guilty during a court appearance.

Investigators said the fire that started July 3, 2018, was ignited by tracer rounds used at a shooting range by Allison Marcus, 22, and Richard Miller, 23. Shortly after the fire ignited Marcus and Miller were cooperative and talked with law enforcement officials.

The fire burned 12,588 acres and three homes near Basalt and El Jebel, 15 air miles southeast of Glenwood Springs.

The date of the trials for the suspects is uncertain, but they could be scheduled for May or June.

Tracer rounds are incendiary ammunition. They have a substance that burns when fired, making the trajectory of the bullet visible during daylight, but especially noticeable at night. Tracer ammunition is banned in many areas, including the area where the Lake Christine Fire started.

Miller and Marcus have been charged with fourth-degree arson.