RIVERSIDE (CBSLA) — Firefighters made significant progress overnight and the brush fire that blackened 250 acres in Sycamore Canyon Wilderness Park near Riverside is now completely contained.

No injuries or structure damage has been reported. Firefighters are continuing to mop up remaining hot spots, according to Riverside Fire Department Battalion Chief Bruce Vanderhorst.

As many as 135 firefighters and 25 engines were dispatched to fight the fire. CBS2/KCAL9’s Nicole Comstock reports the blaze was fought from the ground and the air, with at least two fire-fighting planes and water-dropping helicopters deployed.

(Credit: CBS)

The fire began Saturday afternoon near the northwest part of the park and within a few hours more than 100 acres were burning.

Investigators are trying to determine the cause of the blaze.

(© Copyright 2019 CBS Broadcasting Inc. All Rights Reserved. City News Service contributed to this report.)