DENVER (KDVR) — South Metro Fire Rescue said illegal fireworks sparked a 3-acre fire in a park in Centennial early Sunday morning. The fire came close to a neighborhood but was extinguished before any structures were threatened.

The fire happened in the Willow Spring Open Space near East Arapahoe Road and South Holly Street just after midnight.

Fire crews worked to quickly extinguish the fire and the fire’s spread was stopped within 20 minutes. However, an extensive “mop-up” was needed to fully extinguish all hot spots in the burn area.

Crews used thermal imaging cameras on the ground and in the air with the use of a drone.

Fireworks had been reported in the open space before the fire started.

Investigators found the remnants of a mortar-style firework at South Homestead Parkway and South Niagra Court near the fire, as well as a park trash can full of illegal fireworks.

However, no suspects were identified on the scene.

No injuries were reported and no residential property damage occurred.

In total, 35 personnel from SMFR responded to the incident.

The scene was cleared just before 2 a.m.