FREMONT -- Police have reopened a stretch of Alvarado Boulevard after a car crashed into a power pole causing downed power lines.

The wires were down for about three hours on Alvarado Boulevard between Interstate 880 and Falcon Drive, said Fremont police spokeswoman Geneva Bosques.

A preliminary investigation revealed that just before 2 p.m., a female driver slammed into a power pole and sheared it off. A set of power lines attached to the pole then fell onto the car, Bosques said.

One of the power lines caught on fire, but fire crews quickly extinguished the blaze, Bosques said.

The woman, who suffered minor injuries, was trapped inside the car for a short period of time until firefighters were able to remove her, Bosques said. It was not immediately known what caused the crash.

The woman was taken to a local hospital to be treated for non life-threatening injuries, Bosques said.

The crash left 3,440 PG&E customers in the area without power, said J.D. Guidi, a spokesman for the utility company. As of 4:50 p.m., PG&E had restored power to all but three customers.

David DeBolt and Natalie Neysa Alund cover breaking news. Contact them at ddebolt@bayareanewsgroup.com and nalund@bayareanewsgroup.com.