SONORA -- A woman suffered serious injuries when she was struck by a raised pickup and then run over in Sonora on Tuesday.

About 4 p.m., a vehicle heading south on North Washington Street stopped to allow Ashlee Chatfield, 19, of Sonora to cross the street in a marked crosswalk at Columbia Way, according to Police Chief Mark Stinson.

Meagan Flood, 22, of Sonora was stopped at a stop sign on School Street in a raised Ford F-350 pickup, waiting to make a left turn onto Washington. Flood told police she thought the vehicle that had stopped for Chatfield, had stopped to allow her to make a left turn.

Flood looked to her right and saw no traffic, so she accelerated across the intersection, striking Chatfield in the crosswalk, Stinson said. The impact knocked Chatfield to the pavement, and Flood's pickup ran over her.

Chatfield sustained major head and body trauma and was airlifted to Doctors Medical Center in Modesto, where she was listed in serious condition Wednesday.

The investigation is ongoing and fault has not been determined, Stinson said. He said the height of Flood's truck might have limited her view.