A homeless woman who heard ‘voices in her head’ allegedly bought a knife and stabbed the mother of a 10-month-old baby in a department store in New York City.

Kerri Aherne, 43, was arrested and charged with attempted murder, endangering the welfare of a child, two counts of assault and the criminal possession of a weapon.

She is accused of having stabbed the mother, a 38-year-old tourist from California, at Macy’s Herald Square, the world’s largest department store, on Thursday at around 3.10pm.

The victim was allegedly attacked while she was changing her baby’s nappy in the bathroom.

Prosecutors claim Aherne went to the Macy’s bathroom on the seventh floor and stabbed the woman, causing the baby to drop from the changing table to the floor.

While her baby was not injured in the attac

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