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.
Shots rang through the building, as a gunman killed 26 people, including 20 children.
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.I
This shooting is among the world's worst mass shootings. Here is a look at some others: