Firefighters responded Monday morning to a brush fire that broke out in Anaheim Hills, prompting some mandatory evacations.

By 10:45 a.m., an evacuation order was in place for the area of east of South Weir Canyon Road and South Serrano Avenue, the department tweeted.

The California Highway Patrol has closed the eastbound and westbound lanes of the 91 Freeway to State Route 241.

This map shows where the Anaheim Hills brush fire is burning.

Evacuations also ordered south of the 91 freeway, west of the 241, north of Nohl Ranch Road and east of Serrano.

Evacuated residents were directed to the Downtown Anaheim Community Center, 250 E. Center St., or the Downtown Anaheim Youth Center, 225 S. Philadelphia. Children from Running Springs Elementary Schools were also being bused over to Canyon High School. The blaze was initially reported at 25 acres, but quickly exploded in size – so quickly that fire officials could not estimate its size by midday. Three regional parks – Irvine, Santiago Oaks, and Yorba – were all closed due to the fire and smoke covering the area.

Cal Fire is assisting Anaheim Fire with the fire off of East Santa Ana Canyon Rd., west of Gypsum Canyon. This was the original Canyon Fire and it prompted dozens of evacuations in Corona.