These bombs can drill through concrete to reach underground bunkers.

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A look at the American airstrikes against the Taliban and suspected terrorist targets.

Day 1 | Day 2 | Day 3

In the air campaign over Afghanistan, bombers and cruise missiles played a major roll. Click to view the types.

A look at the first day of strikes against Afghanistan.

Thousands of refugees fleeing Afghanistan for neighboring Pakistan.

A primer on a region in conflict.

A chronological breakdown of the attacks on the World Trade Center.

An in-depth look at the attack on the Pentagon.

An in-depth look at how the World Trade Center was destroyed.

A look at the four Sept. 11 plane hijackings.

Where President Bush was at Sept. 11.