The Airport Fire, which began Sept. 9, has burned more than 23,500 acres in the Santa Ana Mountains between Orange and Riverside counties. It began when Orange County Public Works employees moved boulders with heavy machinery during a heat wave in Trabuco Canyon, fire authorities said.

Airport Fire initially started 1:21 p.m. Sep. 9 in Orange, Riverside County. After being active for nine days, it has burned 23,519 acres. A crew of 2,052 firefighters has been working on site and, by Wednesday evening, they managed to contain 39% of the fire. The wildfire originated from equipment usage.