Tonight several developing stories as we come on the air, millions in the northeast

under threat from flooding rains and heavy snow, the outpouring of support for Britain's

Princess Catherine as she's treated for cancer and the death hole growing in the Moscow terror attack.

First that spring soaker, several inches of rain falling in the northeast.

Philadelphia is setting a new record for the wettest March day ever.

At the peak of the storm today, more than 50 million Americans

under flood alerts.

And the new concern over high winds overnight,

with snow blanketing several states,

our weather team timing it all out.

Also tonight, well-wishers from all over the world expressing support for

Catherine, the Princess of Wales.

After she revealed she's being treated for cancer, the president and first lady among those reaching out,

and the very personal message from Harry and Megan.

New images of a man accused of sneaking onto a plane.

They appear to show him snapping pictures of other

passengers tickets discovered after he exited one of the plane's restrooms.

The Moscow terror attack, the death toll soaring, more than 130 killed at a concert hall.

New video, as Russian authorities arrest the suspected attackers, survivors tell harrowing stories

of gunman who said nothing while methodically shooting people

the ISIS group claiming responsibility and what US intelligence may have

known before the attack. President Biden signing a spending plan that tops a trillion dollars

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