Sgt. Cindi West says witnesses told Maple Valley police that the girl and a 4-year-old boy were playing on swings Wednesday evening when the man approached, talked to the children and picked up the girl.
They say the man put her down when she kicked, screamed and hit him.
West says one witness grabbed the boy to protect him and another witness confronted the man.
Police arrested a 21-year-old Maple Valley man a short distance away and booked him into jail for investigation of unlawful imprisonment.
Maple Valley is southeast of Seattle.
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