A firefighter starts a back fire with a flare gun along San Gabriel Canyon Road in Azusa as the Colby fire rages Thursday. (Wally Skalij / Los Angeles Times)
Firefighters hose down smoldering embers near a home on Pennsylvania Drive in Glendora. (Robert Gauthier / Los Angeles Times)
Firefighters march into dense brush near the foothills in Azusa. (Robert Gauthier / Los Angeles Times)
A Super Scooper air tanker makes a drop on the Colby fire along the Glendora - Azusa border. (Mark Boster / Los Angeles Times)
An inmate hand-crew heads up a fire access road to fight the Colby fire in the hills above Azusa. (Mark Boster / Los Angeles Times)
Rita Abouchedid covers her face from heavy smoke as fire approaches her home on Kregmont Drive in Glendora. (Irfan Khan / Los Angeles Times)
Firefighters try to protect the main house as a fire burns a section of Singer mansion on Kregmont Drive in Glendora. (Irfan Khan / Los Angeles Times)
A water-dropping helicopter flies over the Colby fire burning in the Angeles National Forest. (Mark Boster / Los Angeles Times)
