By CBSLA Staff

BREA (CBSLA) – Brea firefighters with an assist from the Orange County Fire Authority and Los Angeles County Fire Department, Anaheim and Cal Fire are battling a brush fire that charred an estimated 21 acres of grass Sunday.

The brush fire ignited in the area of North Brea Boulevard and Canyon Country Road around 2:20 p.m., according to the Brea Fire Department.

READ MORE: 'Survivor' Contestant Michelle Yi Describes Frightening Santa Monica Assault

As of 4:45 p.m., the fire was 40% contained, OCFA reported. Forward progress of the fire has also been stopped.

READ MORE: Fantasy Football Start Or Sit Week 8: Can Kirk Cousins Put Up Points On The Cowboys Defense?

Around 7:15 p.m., the California Highway Patrol reopened the southbound SR 57 off-ramp to Brea Canyon Road that was closed because of the brush fire. The CHP also canceled the SigAlert.

MORE NEWS: LA County Sheriff's Deputies Armed With Cleaning Supplies Help 86-Year-Old La Mirada Woman Living In Filthy, Unsafe Conditions

No injuries were reported and no structures were threatened.