SEATTLE-- Chelan County Sheriff's officials confirmed Sandra June Bennatts, the mother in an Amber Alert issued Monday, is in custody and her 6-year-old son Mason was found safe.

King County sheriff's Sgt. Sgt. D.B. Grant said deputies tracked the mother through cell phone pings on Highway 2.

The Snohomish County Sheriff's Office tweeted that a deputy had spotted Bennatts' vehicle traveling eastbound on Highway 2 over Stevens Pass just before noon.

When her car sped off at nearly 100 mph, they backed off. She stopped in the Stevens Pass area and was arrested without incident. The boy was in the car.

The boy and his mother were taken into custody.

An Amber Alert was issued early Monday for the autistic boy after authorities say Bennatts, who does not have custody of her son, forced her way into her mother's Auburn home on 186thPlace Southeast at knifepoint Sunday night. Bennatts beat her mother, tied her up and took her son, Mason Bennatts-Miller. She also ransacked the house and stole her mother's grey Acura RDX.

Kathy Spears, DSHS spokeswoman, issued a statement, saying We are grateful the little boy was found safe. He is in the custody of state Child Protective Services, and will be placed in out-of-home care. Meanwhile a CPS investigation will be conducted to determine future living arrangements for him.

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