Happening now breaking news for Americans killed and the Joint Chiefs Chairman says the U.S. should expect additional losses.

An escalating war, new videos showing large explosions in Tehran as the conflict now is clearly spreading.

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

I'm Wolf Blitzer with Pamela Brown, and you're in the Situation Room.

This is CNN Breaking News.

We begin with the breaking news on the spiraling war in the Middle East that we've now learned

that four American troops have been killed in the Iran operation.

Defense Secretary Pete Hexeth spoke about those killed this morning.

We fight to win and we don't waste time or lives.

As the President warned, an effort of this scope will include casualties.

War is hell and always will be.

A grateful nation honors the four Americans we have lost thus far and those injured.

The absolute best of America. May we prosecute the remainder

of this operation in a manner that honors them. Overnight three F-15 U.S. fighter jets crashed

in Kuwait. All crew members survived parachuting, as you see, to the ground.

We're now learning that it was a friendly fire incident.

The U.S. military says Kuwaiti air defenses accidentally shot down the jets.

And just moments ago, the Israeli Prime Minister Benjamin Netanyahu

visited Bates Chemish, the site of an Iranian missile strike that killed nine people just outside Jerusalem.

Listen to his message.

If this regime, this terrorist regime of the kind we've never seen in the world, if they get

nuclear weapons and the means to deliver them, ballistic missiles, intercontinental ballistic missiles, they will threaten all of humanity.

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