Woman shot, killed by police in West Phila.

PHILADELPHIA - December 12, 2012

Police say the woman they shot and killed in West Philadelphia Wednesday night had been trying to stab her own mother.

Officers responded to the 5600 block of Cherry Street around 4:30 p.m.

They say the 27-year-old woman came at them with a knife before they shot her.

She died at the scene.

No officers were hurt.

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