Boulder Police Department and Boulder Fire-Rescue responded to the fire in the 3700 block of Canfield Street at approximately 8:30 a.m. on Thursday.
The building’s automatic fire sprinkler system activated and helped contain the fire to a single unit, although two units sustained smoke and water damage, according to Boulder Police. Residents of the two damaged units were displaced, but other residents have been cleared to reenter the building.
A Boulder Fire-Rescue firefighter was transported to a local hospital with minor injuries. The investigation indicates that the fire was intentionally set, with evidence suggesting multiple items were ignited within the suspect’s apartment unit.
The specific method used to start the fire remains under investigation.
Officers arrested Ranita Ezeonu at the scene. She was booked into the Boulder County Jail on suspicion of the following charges:
- First-degree arson
- Reckless endangerment
- Harassment