The fast-moving grass fire that threatened 30 homes and torched 31 acres east of Napa last Tuesday was apparently touched off by the blade of a mower being used by a resident to cut grass, CalFire Assistant Chief Dave Shew has told the .
The fire in the 1400 block of Coombsville Road was reported at 1:52 p.m. and was contained by firefighters by 3 p.m., according to CalFire Battalion Chief Pete Munoa.
Munoa said no structures were damaged during the fire and that no evacuations were necessary.
The grass fire was in a residential neighborhood with many single-family homes located on large parcels of land, Munoa said.
The blaze was moving toward Napa's Alta Heights neighborhood, where evacuations were considered but not carried out.
Ninety firefighters from Cal Fire, Napa County and the Napa Fire Department utilized 13 fire engines, two hand crews, two bulldozers, an air tanker and a helicopter, Munoa said.
Bay City News Service contributed to this report.