SAN FRANCISCO -- San Francisco police searched Sunday for a mansuspected of throwing a flammable liquid at his girlfriend and severelyburning her.

Officer Carlos Manfredi said witnesses in the city'sBayview District reported hearing the woman screaming. She was taken to ahospital burn unit with life-threatening injuries.

Investigators believe her attacker was 22-year-old Dexter Oliver.

Manfredi said Oliver had a "dating relationship" with the woman, but he did not know the circumstances that led to the attack.

Thevictim's sister told KGO-TV that Oliver doused his girlfriend withgasoline and lit her on fire during an argument at a nearby Laundromat.

Precious Craig said most of her sister's face was burnt, and that the family expects her to recover.