Los Angeles County Fire Department Firefighters extinguished an 8.4-acre brush fire Thursday afternoon near Pitchess Detention Center in Castaic, according to Randall Wright, an LACoFD inspector.

The flames, which didn’t threaten any structures near that the 29300 block of the Old Road were out at 12:37 p.m., and responders are cleaning up all hot spots, which puts the fire at 50 percent contained as of 2 p.m., according to Wright.

More than 100 firefighters responded and three helicopters were dispatched after flames were reported at 12:01 p.m., and units were on scene by 12:04 p.m., according to Wright.

No injuries were reported, said Wright.

Perry Smith contributed to this story.