A 10-year-old girl is in police custody after being accused of killing a 6-month-old infant at a daycare near Chippewa Falls.

The youngster, who can not be identified because of her age, appeared before Chippewa County Circuit Court on Monday - an adult court - because of the severity of the allegation.

Kowalczyk said the sheriff's department got a call on Tuesday from a caretaker at a day care in the town of Wheaton.

She was arrested and later admitted that she hurt the baby saying that she dropped him.

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The patrols are created to "provide reassurance to the boating community and tourists on the water", Queensland Police said. Patrol Inspector Steve O'Connell said the group gave first aid to the victim after he was pulled onto the 12-metre vessel.

The girl panicked and stomped on the child's head, Kowalczyk said. The infant died at a twin cities hospital.

She panicked when the boy started crying and stamped on his head, the court heard. Accompanied by her parents, she sobbed throughout the 10-minute hearing, where Circuit Judge James Isaacson ordered her held on $50,000 cash bond.

According to the Star Tribune, police questioned one adult and three children at the day care center. A doctor attending the baby told investigators the death was not an accident.

While she appeared with her biological parents in court, the Tribune reported that she was with her foster parents, who operate the day care, at the time of the incident.