BREAKING: Shooting at Elementary School

CHRISTINA NG, RICHARD ESPOSITO and CANDACE SMITH
Good Morning America
20 Children Died in School Massacre
20 Children Died in School Massacre (ABC News)

A shooting at a Connecticut elementary school this morning prompted the town of Newtown to lock down all of its schools and drew SWAT teams to the school, authorities said today.

A gunman has been killed and at least one other person has been shot, authorities told ABC News.

The shooting occurred at the Sandy Hook Elementary School in Newtown, about 12 miles east of Danbury.

State Police received the first 911 call at 9:41a.m. and immediately began sending emergency units from the western part of the state.

A photo from the scene shows a line of distressed children being led out of the school.

Newton Public School District secretary of superintendent Kathy June said in a statement that the district's school were locked down because of the report of a shooting. "The district is taking preventive measures by putting all schools in lockdown until we ensure the safety of all students and staff."

State police sent SWAT team units to Newtown.

All public and private schools in the town are on lockdown.

State emergency management officials said ambulances and other units were also en route and staging near the school.

A message on the school district website says that all afternoon kindergarten is cancelled today and there will be no mid-day bus runs.