One person was injured in the hand and another in the buttocks on Moon Island when a gun apparently went off by accident at a police shooting range, authorities say.

The U.S. Marshals Service on Thursday said that two court security officers who are contracted from Walden Security suffered non-life-threatening injuries when a gun went off shortly before 2 p.m. at the Boston police shooting range.

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The two people are in stable condition.

One person was injured in the hand, and another in the buttocks, authorities confirmed following media reports.

Moon Island, which is in Quincy but is owned by Boston, is home to police and fire training facilities. The marshals said the incident took place “during routine firearms qualifications.”