More than two dozen people, mostly elementary school children, were shot and killed at a Newtown, Conn., elementary school this morning, federal and state sources tell ABC News.

Authorities initially believed that there were two gunmen and were performing car-to-car searches around the school. It is currently unclear whether there is still a suspect at large.

"The shooter is deceased inside the building," Connecticut State Police spokesman Lt. Paul Vance said at a news conference. "The public is not in danger."

Authorities said the school building is now secure.

LIVE UPDATES: Newtown, Conn., School Shooting

One shooter was described as a 24-year-old armed man with four weapons and wearing a bullet-proof vest, sources told ABC News.

The massacre prompted the town of Newtown to lock down all its schools and draw SWAT teams to the school, authorities said today.

It's unclear how many people have been shot, but 25 people, mostly children, are dead, multiple federal and state sources tell ABC News. That number could rise, officials said.

President Obama was briefed on the shooting by FBI Director Robert Mueller.

During a call with Connecticut Gov. Dan Malloy, authorities at the news conference said Obama called to "express his condolences and condolences on behalf of the nation and pledge whatever resources the federal government can bring to bear to assist the families and to assist the investigation."


More at: http://abcnews.go.com/US/27-people-dead-children-connecticut-elementary-school-shooting/story?id=17973836#.UMt72G99K20

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