LAUDERHILL, Fla. (AP) — A 12-year-old boy beat a toddler to death with a baseball bat because she was crying while he was trying to watch TV, authorities said.

The boy, who was not identified, was arrested Saturday on first-degree murder charges, Lauderhill police spokesman Lt. Mike Cochran said.

Cochran said the boy confessed to authorities that he was home alone Friday baby-sitting a 10-year-old girl and the 17-month-old girl and became angry when the toddler began to cry. The relationship between the three was not clear.