ABCNewsThe massacre involved two gunmen and prompted the town of Newtown to lock down all of its schools and draw SWAT teams to the school, authorities said today.
One shooter is dead and a manhunt is on for a second gunman.
The second suspect is the dead gunman's brother. Media reports are unclear as to whether he was armed or is suspected as a "second gunman."
ABC NewsAmong the dead was the gunman's mother, found in the school, sources told ABC News.
Also, via CNN:
CNNIt appears that another member of the alleged shooter's family is dead. A senior law enforcement official familiar with the investigation says a brother of the alleged shooter was found dead in a home searched in Hoboken, New Jersey. We already knew Ryan Lanza's mother was found dead in the elementary school.
EDIT: Another correction, as it appears Ryan is the one being questioned (not a suspect), while his brother Adam is, as far as I can tell, the deceased shooter.