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Happening now, breaking news.

At least two people are dead after a shooter opened fire at a K-12

school in Madison, Wisconsin. Police say the suspect, a 17-year-old female student at the

Abundant Life Christian School, is also dead. We're standing by for a live news conference

from authorities this hour.

Plus, sources now tell CNN the U.S. government is sending drone detection systems to New Jersey.

After a series of unexplained sightings, tomorrow lawmakers up on the House Intelligence Committee are set to receive a classified briefing.

This hour, I'll speak with one of them, the New Jersey Congressman Josh Godheimer.

And Robert F. Kennedy Jr. is on Capitol Hill as he tries to win support for his bid to become the U.S. Health Secretary.

President-elect Donald Trump defending Kennedy and his views on vaccines at his first news conference since winning the election.

Welcome to our viewers here in the United States and around the world.

I'm Wolf Blitzer. You're in the Situation Room.

This is CNN Breaking News. We begin our coverage tonight with the breaking news in Wisconsin, another shooting at an American school by CNN's count at least the 803rd of this year.

A source now tells CNN the suspect, now deceased, used a 9-millimeter

pistol. CNN's Whitney Wilde is covering the story for us from Madison, where we're expecting

a news conference just a short time from now. Whitney, give us the latest.

...