A police officer was stabbed by an 11-year-old boy in Lowell, MA, Sunday, officials said.

According to Lowell Police Chief Tim Crowley, the officer was patrolling around 5 p.m. when he saw a disturbance.

“When he got out of his cruiser to check on it and approached the group, he observed an 11-year-old child come running out of the house with a knife over his head running after another kid, so he intervened,” Crowley told WBZ NewsRadio 1030.

The officer suffered two stab wounds on his arm. He was treated at a local hospital and released.

The boy now faces charges, including juvenile delinquency, assault and battery with a dangerous weapon, and assault and battery on a police officer. He will be arraigned in a juvenile court, CBS Boston reports.