At least four fires are burning within 100 miles of Los Angeles. Here’s a quick look at where they are and what you need to know.

Fire on bridge

The bridge fire broke out Sunday afternoon in the Angeles National Forest northeast of Glendora in the East Fork of San Gabriel Canyon. By Tuesday evening, the fire had grown to thousands of acres and was burning out of control. Mandatory evacuations had been expanded, including in Wrightwood and Palmdale.

Smoke from the bridge fire dominates the landscape as it burns in the Angeles National Forest.

(Angeles National Forest)

Live camera footage from Mountain High Resort showed flames raging through a ski lift area.

Firefighters are battling the blaze while an extreme heat warning is in place until Wednesday afternoon. Low humidity and gusts of wind are making it harder to extinguish the fire.

Surface: 34,240

Containment: 0%

Mandatory evacuations:

• 30 homes in Wrightwood and Palmdale
• East Fork communities of Camp Williams Resort, including a mobile home park and campground, and the adjacent river community
• Homes along Mt. Baldy Road and all residents north of the San Antonio Dam up to Mt. Baldy

Shelters:

• Hacienda Heights Community Center at 1234 Valencia Ave., Hacienda Heights
• Jessie Turner Health and Fitness Community Center at 15556 Summit Ave.
• Devore Animal Shelter at 19777 Shelter Way, San Bernardino, for animals

Fire at airport

The airport fire, caused by a spark from heavy equipment, exploded Monday in Trabuco Canyon and raced up the Santa Ana Mountains Tuesday. At least three people were injured: two firefighters from heat-related injuries and one civilian from smoke inhalation.

Surface: 19,000

Containment: 0%

Mandatory evacuations:

• Robinson farm
• Trabuco Highlands
• The Highlands apartment complex
• Blue Jay Campground
• Caspers Regional Park

Shelters

• Bell Tower Regional Community Center at 22232 El Paseo in Rancho Santa Margarita
• Orange County Fairgrounds at 88 Fair Drive in Costa Mesa for large animals

Line fire

The Line fire started Thursday in San Bernardino County. Three firefighters were injured in the first few days of the fire. Firefighters had to navigate steep terrain with difficult access, particularly in the Big Bear area, according to Cal Fire. There were 65,600 structures threatened by the fire.

Surface: 32,905

Containment: 14%

Mandatory evacuations:

• The area east of Orchard Road to Cloverhill Drive from Highland Avenue north to the foothills
• Running Springs and Arrowbear Lake
• Forest waterfalls
• Mountain House Village
• Angelus Oaks, Seven Oaks and all the campgrounds and cabins in the area
• Areas north and east of Highland Avenue and Palm Avenue
• Green Valley Lake north of Highway 18 along Green Valley Lake Road
• Big Bear from the dam east to Wildrose Lane and the southern shoreline south to Bluff Lake Basin

Shelters:

• The San Bernardino County Fairgrounds at 14800 7th St. in Victorville
• Jessie Turner Health and Fitness Community Center at 15556 Summit Ave. in Fontana
• Devore Animal Shelter at 19777 Shelter Way in San Bernardino

Roblar fire

The Roblar fire started Saturday afternoon at Camp Pendleton off Case Springs Road in San Diego County. There is no danger to personnel or structures, Camp Pendleton said.

Surface: 1,000

Containment: 85%