Tonight terror gripping Afghanistan suicide bombers killed 12 U.S. service members and injured 15 more at the Kabul airport, making it the deadliest day for the military there in a decade.

And the president tonight vowing revenge. The ultimate nightmare scenario. Graphic and devastating scenes near the airport.

Dozens of innocent Afghans killed.

Survivors using a wheelbarrow to get victims to the hospital.

How did the terrorists get through checkpoints?

And why the military says the threat isn't over.

Plus, the mission continues the military vows to keep evacuating Americans

and Afghans. But what about retaliation? We will not forgive. We will not forget.

We will hunt you down and make you pay. Delta's summer surge, no room in the ICU,

as medical staff battle to save lives at an Oregon hospital.

As ICU nurses, we're used to winning, and we're not winning.

In our back-to-school series, a focus on mental health,

the groundbreaking program to help students as they return to the classroom.

Travel slow down. Why are Americans suddenly canceling their flights? Plus, will Europe soon ban American tourists?

Dangerous storm forming, the latest on what could become a major hurricane.

And Mission of Hope, U.S. service members in Afghanistan show the best of humanity,

risking their lives to save others.

This is the CBS Evening News with Nora O'Donnell, reporting from the nation's capital.

Good evening, and thank you for joining us.

We are going to begin tonight with that breaking news on one of the darkest days for the U.S. military in more than a decade.

As troops were overseeing the evacuation, twin suicide attacks near the Kabul airport,

killed at least 12 U.S. service members, 15 others were wounded.

...