LONE TREE, Colo. — The fast-moving brush fire in Lone Tree is now under control, South Metro Fire Rescue officials said in a post. Crews are mopping up and checking for hot spots.

The 20-acre fire burned near South Peoria Street and Ridgegate Parkway in Lone Tree, according to officials. The cause of the fire is still under investigation. South Metro Fire said firefighters got the call for the fire around 3:20 p.m. and were on scene within six minutes.

South Metro Fire crews works to put out a 20-acre brush fire burning near South Peoria Street and Ridgegate Parkway in Lone Tree. South Metro Fire crews works to put out a 20-acre brush fire burning near South Peoria Street and Ridgegate Parkway in Lone Tree. South Metro Fire crews works to put out a 20-acre brush fire burning near South Peoria Street and Ridgegate Parkway in Lone Tree.

No structures were threatened, but Westbound Ridgegate Parkway was closed to traffic near Meridian Village Parkway, officials said. One lane for westbound traffic was reopened, officials said around 4:45 p.m.

The fire comes during a week of record-high temperatures and as red flag warnings are in effect throughout the state, with officials warning that any spark can start a fire. Follow along with more fire and weather updates in our weather blog here.

Frann Beg, who lives about a half mile from where the fire burned, said he's concerned about the high temperatures and dry conditions.

Frann Beg, a Parker resident, points toward the burn scar about a half a mile from his home.

"Especially since it's March, and we just broke records. And then if this is going to start now, imagine when May and June come when it is fire season. So, it's going to be a big concern for all of us neighbors," said Beg.

South Metro Fire said on red flag warning days, brush trucks will follow fire engines to every call in case they need to respond to a fire. Jenn Abraham, a Public Information Officer with South Metro Fire, said power lines in the area of the fire were also a concern while crews knocked down the flames.

"It absolutely adds to a threat. Power lines, obviously, electricity, is going to add any kind of concern. Right now, it's under investigation, the cause of it, so we are unaware what caused this fire," said Abraham.