PETALUMA, Calif. (AP) _ A woman locked in the trunk of a moving car threw emergency flares through a taillight hole and waved what appeared to be a white sock to attract attention, police said.

The man driving the car was arrested Monday for investigation of kidnapping, said Sonoma County Sheriff's Lt. Chuck Smith. Scott Willyard, 30, of San Francisco was held without bail and will be arraigned Wednesday in Santa Rosa Municipal Court, Smith said.

Motorists called authorities Monday after seeing the flares and hearing the woman's muffled screams, authorities said.

Deputies followed the car off a highway in Petaluma, north of San Franciso, and gave chase. They caught the driver after he tried to flee on foot after crashing the car into an embankment, authorities said.

The woman, Anece Satterfield, 36, of Oakland complained of back pains and was treated at a hospital for two superficial stab wounds in the back before being released, Smith said.

He said Willyard and Satterfield knew each other, but said they offered conflicting stories and details of the incident were unclear.