Tonight, the jet crash mystery was a passenger plane shot down.

Dozens killed, dozens somehow surviving.

How did the plane get so off course and what hit it?

New video revealing what passengers saw inside the cabin.

Now, U.S. officials say the jet may have been hit by a Russian anti-aircraft system, as Moscow

warns against speculation.

Reported tornadoes touching down in Texas.

This video just in tonight, as severe storms hit near Houston, heavy rained and wild winds

smash the west coast.

We'll show you the dangerous weather across the U.S.

Also breaking tonight, the Stowaway stopped as a plane was taxing for takeoff,

how flight crews found the latest Delta passenger to manage to sneak through multiple layers of security. President-elect Trump's immigration policy takes shape. We ask the incoming border czar for answers.

Will he bring back family detention and the looming fight between the federal government

and cities that don't want to deport people?

Our investigation, doctors told this cancer patient she needed routine screening,

why her health insurance declined it as her

cancer got worse. Bird flu spreading the deadly impact on big cats and now the pet food recall

sparking alarm. This is NBC Nightly News with Lester Holt. Good evening. I'm Tom Yamas, in for Lester.

We start tonight with the growing mystery over what caused the crash of that passenger jet on Christmas

Day and the possibility. It was no accident.

Onlookers watched in horror as the Azerbaijani plane, you see it here, banked, then crashed in a fiery ball,

leaving 38 people dead, while remarkably 29 others survived.

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