BOSTON (AP) — Authorities say a 9-year-old boy has lost a hand while playing with fireworks in Boston.

Police say a 5-year-old boy was also injured in the accident Sunday in the Dorchester neighborhood.

The 9-year-old’s family says he is being treated at Boston Children’s Hospital.

Investigators are trying to determine where the illegal fireworks came from.

The state fire marshal’s office says a man was hospitalized with serious injuries to his hand while igniting fireworks Saturday in the backyard of a home in Saugus. Investigators found a large cache of fireworks in a bedroom of the home.

Authorities also reported large seizures of fireworks over the weekend in Pembroke, Hyannis and Dennis.