The gunman in the Connecticut elementary school was previously wrongly identified as Ryan Lanza, but according to the latest reports reveal it was actually his younger brother Adam who went into the school, shot his mother and 28 others.
Lanza, 20, entered the Connecticut elementary school where his mother worked as a teacher, killing 26 people, including 20 children. A law enforcement official identified the gunman as 20-year-old Adam Lanza, the son of a teacher. A second law enforcement official said his mother, Nancy Lanza, was presumed dead.
Adam Lanza's older brother, 24-year-old Ryan, of Hoboken, N.J., was being questioned, the first official said. Earlier, a law enforcement official mistakenly identified Ryan as the shooter.
After his killing rampage, authorities added, Adam Lanza turned the gun to himself and pulled the trigger.
The shooting appeared to be the nation's second-deadliest school shooting, exceeded only by the Virginia Tech massacre in 2007, which left 32 people and the gunman dead.
The Connecticut Post reports police are also questioning a handcuffed man in connection with the shooting. Witnesses told the newspaper he was led out of the woods by officers.
Shortly after 9:40 a.m., authorities reported that a shooter was in the main office of the school. A person in one room had "numerous gunshot wounds," police told the Hartford Courant.
A dispatcher at the Newtown Volunteer Ambulance Corps said a teacher was shot in the foot and taken to the Danbury Hospital. Local news outlets also reported that the principal was among those shot.
Lisa Procaccini told Fox News that her daughter was sitting in a classroom when she and others heard gun shots.
"She was in a small class -- a reading group and they started hearing bangs," Procaccini said. "Her teacher, and I'm grateful for this, rushed kids into the bathroom and locked the door. They told kids it was hammering and tried to keep them calm."
"Children were crying," Procaccini said. "She did tell me about a little boy that was in a police officer's arms, bleeding. I don't know if she gets it."
The Bureau of Alcohol, Tobacco, Firearms and Explosives said two firearms were recovered from the scene.