Police say 27 people were killed in the shooting at a Connecticut elementary school, including the gunman, and one person died at another scene.
The dead at the school include 20 children.
The gunman opened fire Friday morning inside a school where his mother worked. He blasted his way through the building as young students cowered helplessly in classrooms while their teachers and classmates were shot.
Young students crying and looking frightened were escorted by adults through a parking lot in a line after the shots rang out in Newtown, 60 miles northeast of New York City.
The attack comes less than two weeks before Christmas and appears to be the nation's second-deadliest school shooting, exceeded only by the Virginia Tech massacre in 2007.
The man suspected of gunning down more than two dozen people in a small town in Connecticut is the son of a teacher at the elementary school where the killings occurred, and his mother is presumed to be among the dead.
Police say Adam Lanza apparently drove to his mother's school carrying two handguns and a .223-caliber rifle and carried out the massacre. Law enforcement officials are trying to learn as much as possible about the 20-year-old and questioning his older brother, who is not believed to have any involvement in the rampage.
So far, authorities have not spoken publicly of any possible motive.
Several neighbors of the Lanzas in Sandy Hook, a community about 60 miles northeast of New York City, said they knew little about the family.
Schoolchildren and their parents are describing the scene at a Connecticut elementary school today, as teachers locked doors and ordered the children to huddle in the corner or hide in closets.
One man says his 6-year-old son was in class when the gunman burst in and shot the teacher. He says his son "grabbed a bunch of his friends and ran out the door."
The father of one 7-year-old says the boy heard a noise that sounded like "cans falling." A teacher went out to check on the noise, came back in, locked the door, and had the kids huddle in the corner until police arrived.
A teenager who rushed to the school to check on his sister, after hearing the gunfire from his nearby home, says the 9-year-old girl had heard a scream come over the intercom at one point.
As they left the school, the children -- some crying, others looking frightened -- were told by police to close their eyes, so they wouldn't see the carnage around them.
Frantic parents rushed to the school to check on their children. One man says his 8-year-old daughter heard two big bangs, and teachers told her to get in a corner. The daughter was fine.
A woman says it was "the happiest moment" of her life when she found her own 8-year-old daughter safe.
The 17-year-old brother of a 9-year-old girl at the school says he raced to the school, and found she was OK. He says his sister heard a scream come over the intercom at one point. The teen says teachers were shaking and crying as they came out of the building.
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