Vancouver Acid Attack: "Hey, Pretty Girl, Do You Want to Drink This?"

VANCOUVER, Wash. (CBS/AP) Bethany Storro, a 28-year-old Washington state woman, was severely burned when a stranger threw an acid-like liquid in her face. Storro is listed in serious condition in a Portland, Ore., hospital's burn center.

PICTURES: Bethany Storro, Acid Attack Victim

Nancy Neuwelt is the mother of the injured woman. Neuwelt tells The Oregonian that  her daughter was attacked Monday evening while getting something out of her car in downtown Vancouver.

Neuwelt says a young woman walked up to her daughter, said "Hey, pretty girl, do you want to drink this?" and tossed a cup of liquid in Storro's face.

According to the Oregonian, the liquid burned holes in Storro's blouse.

Neuwelt says her daughter bought a pair of sunglasses shortly before the attack, and that may have saved her eyesight. Still, Storro's family says her face will take months to heal. The paper reports that she may need skin grafts.

Vancouver police spokeswoman Kim Kapp says doctors and authorities are trying to determine what kind of substance caused Storro's facial burns.

Police have not determined a motive for the attack.