Adam Lanza identified as gunman in Sandy Hook Elementary School shooting in Newtown, Connecticut

NEWTOWN, Conn. - The gunman who walked into a school in Connecticut on Friday morning and opened fire was the son of a kindergarten teacher at the school, ABC reported.

Initially the gunman was identified as 24-year-old Ryan Lanza, of New Jersey. However, AP later clarified that the gunman wasn't Ryan Lanza but Adam Lanza,  his younger brother.

ABC said the gunman took his own life inside his classroom. The older brother, Ryan Lanza,  was undergoing questioning by police.

"The shooter is deceased inside," said a state police spokesman.

ABC News is reporting the suspect's mother was a kindergarten teacher at the school. NBC News reported that most of the casualties were in her classroom.

ABC News said that the woman died at the school.

The network is also reporting that a dead body was found in Lanza's home. Reports said the victim may be Lanza's father.

ABC said Lanza was armed with four weapons and wearing a bullet-proof vest when he opened fire.