A law enforcement official said the suspect in the Connecticut school shootings is 20-year-old Adam Lanza, the son of a teacher at the school where the shootings occurred.
The first official said Adam Lanza's older brother, 24-year-old Ryan, of Hoboken, N.J., is being questioned by police. An earlier report from a law enforcement official mistakenly transposed the brothers' first names.
Both officials spoke on the condition of anonymity because they were not authorized to speak on the record about the developing criminal investigation.
The first official said Adam Lanza is dead from a self-inflicted gunshot wound.
Authorities say the shooting at Sandy Hook Elementary School in Newtown, Conn., took place in two rooms, but they are not giving details on exactly how it unfolded.
26 were killed in the shooting. 20 were confirmed children. The students' ages range from 5 to 10 years old. The six other vicitms were adults.
A second official said one of the teachers killed is presumed to be Nancy Lanza, the mother of the shooter.
Newtown police called Connecticut state police around 9:40 a.m. A SWAT team was among the throngs of police to respond to the school, about 60 miles northeast of New York City.