Police are investigating how a 5-year-old boy was shot in the shoulder in his home in The Bronx, New York City, Friday, authorities said.

The boy's mother and father were in their bedroom in Morrisania when they heard a pop noise shortly after 10:30 a.m., police said.

They rushed to their 5-year-old son's room and found him shot.

Police said it was not clear if the boy accidentally shot himself or if his 11-year-old brother accidentally shot him.

The father drove the boy to nearby Lincoln Hospital, where he was listed in stable condition.

The investigation was continuing.