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Happening now stunning developments out of Syria, where rebels have just entered the major Syrian city of Aleppo for the first time in eight years.

This surprise offensive catching Bashar al-Assad's government forces totally off guard,

a drastic escalation in the country's civil war.

And we're tracking new threats of political violence, this time against Democrats.

Six lawmakers targeted with bomb hoaxes just days after

several of Donald Trump's cabinet picks faced similar threats. And also tonight, investigators

in New York are trying to figure out how a woman was able to bypass multiple security

checkpoints at JFK International Airport and then board a Delta flight to Paris, apparently stowing away

in the plane's bathroom. Welcome to our viewers in the United States and around the world.

Wolf Blitzer is off today. I'm Alex Mark Ward and you're in the Situation Room.

We begin our coverage tonight with a major flare up in Syria.

Rebel forces there making a surprise move into Aleppo.

The first time they've set foot in the country's second largest city since government forces recaptured it back in 2016. Let's get all the latest

details from CNN's senior international correspondent Ben Wheateman. So Ben, this is quite remarkable.

Walk us through how all this unfolded and what's happening right now.

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