Connecticut state police say multiple 30-round magazines and hundreds of bullets found at elementary school where 26 were killed.
State Police Lt. Paul Vance also said Sunday that authorities have officially identified the gunman in the school rampage as Adam Lanza. They say his mother, Nancy, as was one of his victims.
Residents of Newtown are preparing for a visit by President Barack Obama. He is scheduled to attend an interfaith vigil in the evening.
The shooting is the largest massacre of school-age children in U.S. history.