An 11-year-old boy in Boston was mauled by a dog Wednesday and was undergoing surgery for his "vicious" injuries, authorities said.
An off-duty Boston police officer was in the city's Dorchester neighborhood around 12:10 p.m. when he heard screams, the Boston Police Department told Fox News.
He found the child being attacked in a backyard by a pit bull, Police Commissioner William Gross told reporters. The officer opened fire using his service weapon to stop the attack, police said.
It was not clear if the dog was hit. The boy was taken to a hospital with non-life threatening injuries and two dogs were taken by animal control officers.
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