An anonymous tip led Spokane police today to arrest the woman accused of assaulting her 3-year-old son at the downtown bus plaza.

Keyana L. Key, 28, was hiding with her three young children at an apartment at 1400 N. Lincoln when police arrived about 4 p.m.

Police say her sister, Aletha A. Robinson, 38, was helping Key hide and was arrested on a second-degree rendering criminal assistance charge. Key was jailed on one count of second-degree assault of a child.

"The 3-year-old victim appeared lethargic and was transported to a local hospital for tests to determine injuries," according to Spokane police. "Key's two other children were placed in the custody of Child Protective Services."

Police on Thursday released video of the assault, leading to tips that took police to several addresses in Spokane today. The video shows a woman believed to be Key throwing the boy to the ground about 7:30 a.m. Wednesday after apparently missing a bus.

"The Spokane Police Department would like to thank the citizens who called in tips and helped us locate the suspect," Tracie Meidl wrote in a news release. "If you believe a child has been assaulted or is being abused, please call Crime Check or 9-1-1 if it is an emergency."

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