Ryan Lanza is a suspect involved in the Sandy Hook Elementary School shooting in Connecticut on Friday.
Lanza's younger brother is being held for questioning as a possible second shooter. The law enforcement officials said the boys' mother, Nancy Lanza, works at the school as a teacher, according to reports.
The 24-year-old opened fire inside his mother's Connecticut elementary school classroom Friday morning in a rampage that left 27 people dead, including 18 children and his mother, according to the Associated Press.
After his killing rampage, authorities added, the shooter 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.
