Tonight, breaking news, an active shooter in Colorado, the situation unfolding as we're coming on the air.

Multiple people have been shot at a popular grocery store in Boulder.

The first calls to police less than two hours ago.

Store windows blown out victims on the floor as police surround the building.

Live pictures from the scene.

Fourth vaccine, fourth wave. AstraZeneca says its coronavirus shot is 100% effective at preventing

severe COVID. Plus, with millions now traveling, new alarm bells about the potential for a

fourth wave of the virus. We are a critical point in this pandemic.

A fork in the road.

State of emergency, the crackdown tonight at one of the country's hottest destinations

after crowds clash with police on the streets of Miami Beach, the latest on the strict

new curfew and fears of a super spreader spring break.

Overwhelmed the Biden administration struggles to house around 16,000 children who have crossed

the southern border.

Tonight, the stunning images inside a crowded holding facility and the little boy all alone.

Capital charges as the security fences around the House and Senate come down,

the investigation into the January 6th insurrection heats up. What a top federal prosecutor

tells CBS news about possible charges of sedition and why President Trump hasn't been ruled out.

River of fire, the up-close look at the volcano that's erupting now.

So where is all that lava heading?

And March Mayhem, the buzzer-beaters, COVID knockouts, and Cinderella stories,

why this year's tournament is much more than madness.

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