STOUGHTON — A 17-year-old boy was shot and killed in Stoughton Saturday while he was in the basement of his family home with his 21-year-old brother, authorities said.

David Wade, a senior at Stoughton High School, was shot by his brother, but no charges have been filed in the case, Norfolk District Attorney Michael W. Morrissey said at a press conference Saturday night.

A press release from the district attorney’s office earlier in the day said police were investigating the incident and had not ruled out that it may have been an accident.

Wade’s parents and three brothers, including the 21-year-old man, were all home at the time of the shooting, Morrissey said.

The district attorney released few details, but said the 21-year-old brother received his firearms license in the past couple weeks and the gun involved belongs to a family member.

Both the alleged shooter and Wade’s mother called 911 about 3:30 p.m., and the family tried to render medical care before emergency responders arrived, Morrissey said.

Wade was taken to Good ­Samaritan Medical Center in Brockton, Morrissey said, where doctors performed emergency surgery.

“It’s fair to say that the family is extremely devastated and they are cooperating with ­police at this time,” the district attorney said.

A short distance away at St. James Catholic Church, a few teens and adults gathered in the basement to grieve Saturday night.

Ann Marie Collins, a St. James parishioner and a ­neighbor of the Wades, described them as “a very close-knit, loving family, and everything they do is family- ­centered.”