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GLENDORA(CNS) - Firefighters worked through the night to improve the 78  percent containment line around the five-day-old fire in the San Gabriel  foothills above Glendora, U.S.Forest Service officials said.

The Colby Fire affected neighborhoods along the steep mountain slopes  on ridges between Glendora and the San GabrielRiverCanyon in the Angeles  National Forest. It has scorched 1,906 acres, destroyed five homes, damaged 17  others and injured three people.

Containment lines still have to be established amid the loose rocks to  the north and east in the wilderness between Highway 39 and the Glendora  Mountain Road, Forest Service officials said.

Residents of the Mountain Cove subdivision north of Azusa were allowed  to return to their homes at Saturday, just as red flag warnings expired,  according to the Los Angeles County Sheriff's Department. Hundreds of other  evacuees had been allowed to return home Friday.

Full containment was expected by Wednesday, Forest Service officials said.

The fire was allegedly set by three young men tossing papers into a  campfire on Colby Trail before sunrise Thursday as hot and dry Santa Ana winds  buffeted the scrub brush. At the peak of the blaze Thursday, fire descended  from the mountains into residential neighborhoods as 1,175 firefighters, nine  helicopters and two SuperScooper aircraft were thrown into an aggressive fire  attack.

The three people injured included a woman who was hit by a burning palm  frond that fell on her back. One firefighter suffered an ankle injury that did  not require hospitalization, and an other was taken to a hospital for treatment  of a minor burn, authorities said.

Clifford Eugene Henry Jr., 22, of Glendora and Steven Robert Aguirre,  21, a transient last known to live in Los Angeles, remained jailed in lieu of  $500,000 bail on suspicion of recklessly starting a fire. Jonathan Carl  Jarrell, 23, of Irwindale remained jailed in lieu of $20,000 bail.