LOS ANGELES (AP) — Pacific Gas and Electric Co. power lines that came into contact with trees caused four Northern California wildfires that burned across more than 14 square miles last fall and incinerated 134 buildings, state fire officials said Friday. The California Department of Forestry and Fire Protection indicated three of the fires might have been prevented if PG&E had made more effort to keep trees clear of its power lines. CalFire said it is turning those findings over to local prosecutors in the counties where the blazes occurred. PG&E said it is reviewing the agency's conclusions, adding safety remains its paramount goal. "Based on the information we have so far, we believe our overall programs met our state's high standards," the utility said in a statement. The utility said it inspects and monitors every overhead electric transmission and distribution line at least once a year under its Vegetation Management Program. No one was killed or injured by the four fires the agency addressed Friday. The blazes in largely rural Nevada and Butte counties were among more than 170 that broke out across California last October, consuming more than 380 square miles of forest, farmland and vineyards.