Investigators said Anh Bao Nguyen-Duffy has not been at school since, and her whereabouts were not known. She is believed to be with her father, 37-year-old Hung Bao Nguyen. The two were last seen in the 10300 block of SE 264th Street in Kent.
Police are now looking for a 1998 black Ford F-150 with Washington license plate number B27504V in connection with the girl's disappearance.
The father's photo was not available. He is said to stand 5 foot 7 inches tall and weigh approximately 145 pounds. Police said he is wanted for felony harassment, second-degree arson and assault, and should not be approached.
The girl is 3-foot-5 and weighs about 45 pounds. She has straight black hair with red highlights, and was last seen wearing a white jacket, jeans and green shoes.
Anyone with information on the pair's whereabouts is urged to call 911 immediately.