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CLAREMONT, the Bronx — A 29-year-old dad was killed and his 5-year-old son was shot in the arm in the Bronx on Tuesday afternoon, police said.

The 911 call reported a shooting in a 6th floor stairwell of a New York City Housing Authority building on Webster Avenue around 4:30 p.m.

Lieutenant Eric Dym, a former member of the Marine Corps and an officer with Special Operations, took off his belt at the scene and used it as a tourniquet for the boy’s right arm.

Jaquan Millien and his son were rushed to the hospital in critical condition, officials said. Millien died at the hospital and his son is now in stable condition.

Lieutenant Dym described the boy as calm and “very brave.”

The boy had just been picked up from school by his father, NYPD Chief of Housing James Secreto said.

No arrests have been made.