Adam Lanza, the suspected shooter of an elementary school in Newtown, Conn. is believed to have suffered from a personality disorder, the Associated Press reports:
Police shed no light on the motive for the attack. The gunman was believed to suffer from a personality disorder and lived with his mother in Connecticut, said a law enforcement official who was briefed on the investigation but was not authorized to publicly discuss it.
Ryan Lanza, the brother of the suspected shooter, cooperated with police and had reportedly not been in contact with Adam Lanza since 2010:
The law enforcement official who said Adam Lanza had a possible personality disorder said Ryan Lanza had been extremely cooperative, was not believed to have any involvement in the rampage and was not under arrest or in custody, but investigators were still searching his computers and phone records. Ryan Lanza told law enforcement he had not been in touch with his brother since about 2010.