A 32-year-old woman allegedly stabbed her 8-day-old son and the baby's father, claiming God made her do it because the baby was created "by the devil".
WPXI-TV reports police arrested Tanishia Fielder on Friday on charges of attempted homicide, aggravated assault, terroristic threats and other charges, news.com.au reports.
The baby was stabbed near the eye. His condition and that of his father weren't known.
Police found a knife hidden beneath a garbage bin behind Fielder's apartment in the US city of Pittsburgh, Pennsylvania.
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Witnesses who tried to help the man and baby before Fielder chased them away told police she was wielding a knife that matched the one under the bin.
She said God told her she needed to kill the baby, dismember him and throw him in the garbage because he was "by the devil".
The baby's father, Darwin Hanner, told police he and Fielder had argued earlier in the day.