Nearly 8,000 San Diego Gas and Electric customers had their power shut off Friday morning in yet another effort to reduce wildfire risk due to strong Santa Ana winds.

The red-flag warning extended Wednesday for the county’s inland valleys still is set to expire at 6 p.m. Friday, with overnight northeast winds of 28 to 38 mph and possible gusts of 50 mph, up to 60 mph after midnight.

The Mission Fire burned five acres in Fallbrook, California, before being contained by fire crews, damaging an outbuilding.