She is identified as 10-year-old Qadr Williamson.
Officials say her foster mother last saw her on the 300 block of Glen Echo Road around 7:45 a.m. Thursday.
She is 5' 5" tall and is believed to be wearing black pants, a black shirt, a blue hoodie and black sneakers.
Anyone who knows where the child is should contact Northwest Detectives Division at 215-686-3353 or 911.
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