NEWTOWN, CT - The suspect in the Connecticut school shootings is Adam Lanza, the son of a teacher at the school where the shootings occurred, a law enforcement official told The Associated Press.
The suspected gunman was first identified as Ryan Lanza by multiple news sources, including ABC News, CNN, and The Associated Press.
After reports of confusion, The Associated Press later confirmed that 20-year-old Adam Lanza is the suspect and has died.
A law enforcement official briefed on the investigation said the brother of the gunman has been "extremely cooperative" and is not under arrest.
The official told The Associated Press that Ryan Lanza, of Hoboken, N.J., is still being questioned but is not in custody and is not believed to have any connection to the school killings.
Ryan Lanza told law enforcement that his brother was believed to suffer from a personality disorder and be "somewhat autistic" and lived with the mother in Connecticut, another official said.
According to a different official, Adam Lanza drove to the elementary school in his mother's car.
The Associated Press reported that three guns were found at the scene: a Glock and a Sig Sauer, both pistols, and a .223-caliber rifle.
The rifle was found in the back of a car at the school, and the two pistols were in the school.
The officials spoke on condition of anonymity because they are not authorized to speak publicly on the investigation.
The official said Ryan Lanza's computers and phone records were being searched but only "in an abundance of caution."
He said Ryan told authorities he had not been in touch with his brother in recent years.
Lanza's mother was among the dead Friday morning at Sandy Hook Elementary School in Newtown, Connecticut, according to ABC News. She was a teacher at the school.
A law enforcement official said Lanza's girlfriend and another friend are missing in New Jersey.
One of the officials said police eventually talked with the girlfriend. And one of the friends had to be reached in California.
Authorities said 20 children and six adults were killed.
An official told The Associated Press the shooter died from a self-inflicted gunshot wound.
The deceased gunman and another body found at a separate location brought the toll to 28.