LOS ANGELES (MCT) — It could take at least a week to wrestle the fire churning through the Angeles National Forest into submission, authorities said Monday as the blaze grew to 3,600 acres and injured five people, including at least two of the 500-plus firefighters who had swarmed into the hills above Azusa, Calif.

The blaze, which officials dubbed the Williams fire, erupted Sunday afternoon about three miles east of California 39, between Camp Williams Resort and Burro Canyon Shooting Park in the San Gabriel Mountains. By Monday evening, it was still only 5 percent contained, but no structures had been lost and none were threatened, Angeles National Forest spokesman Nathan Judy said.