The Institute of Islamic and Arabic Sciences was a key part of a Saudi campaign to spread Wahhabi Islam, but now only holds Friday prayers, with sermons that are "nothing controversial," one man said.

Galleries

The 10 days between Sept. 11 and Sept. 20, 2001 marked a crucial turning point in the country's history as the U.S. confronted the threat of international terrorism. This washingtonpost.com photo gallery tells how the president and his principal advisers settled on a strategy aimed at destroying the terrorist threat.
• 10 Days in September
• The World Reacts

Video Features

• Flash: Fall of the Twin Towers

Graphics

• Attack on the Pentagon
• Attack Sequence: New York
• Animated Flight Paths of Hijacked Planes
• The Plot
• Full Archive of graphics, maps and images searchable by topic.

Audio

• Audio Tapes Released Read a complete collection of transcripts of the EMS and Fire Department records of 911 calls from the World Trade Center.

Salafi Islam

Goal of Isolation a Challenge

Followers of conservative sect try to allay fears that their brand of Islam fosters extremism.

Young U.S. Muslims Strive for Harmony

American Muslims debate ways to incorporate their religion into daily life, an increasingly difficult task since the attacks of Sept. 11, 2001.

Hardball Tactics in an Era of Threats

To the government, they were a terrorist risk in the Washington area. To local Muslims, they were unfairly singled out for prosecution and severe sentences.

Blunders Left FBI With Outdated Software

Because of an open-ended contract with few safeguards, SAIC reaped more than $100 million, even though its program never worked properly.

• Transcript: Post's Dan Eggen

Old-School Academy in Post-9/11 World

Curriculum for training new FBI recruits is adapting to reflect the agency's focus on terrorism.

• PHOTOS: FBI Training

An Arduous, 18-Week Path to the Badge

Five years after attacks, some security experts question whether FBI has done enough to prepare agents for the difficult challenge of countering terrorism.

FIVE YEARS LATER : Microbes Made From Scratch

Custom-Built Pathogens Raise Bioterror Fears

Custom-built pathogens raise bioterror fears as new technology is hurtling past countermeasures.

Five Years Later

The Secretive Fight Against Bioterrorism

Work at new lab could someday save thousands of lives -- or create new risks and place the U.S in violation of international treaties.

• VIDEO: Preparing for Microbes

• Special Report: Remembering 9/11

Recent Coverage of Sept. 11 and the War on Terror

FIVE YEARS LATER: The Bureaucratic Front: Fighting Terrorism and Disorganization (Post, August 9, 2006; Page A01)

Model Center Shares Data Old-Fashioned Way (Post, August 9, 2006; Page A07)

America's Character: In the Debris of 9/11, Bravery, Not Conspiracy, Stirred Oliver Stone (Post, August 8, 2006; Page C01)

Officials Didn't Lie to Sept. 11 Panel, Pentagon Says (Post, August 6, 2006; Page A08)

9/11 Panel Suspected Deception by Pentagon: Allegations Brought to Inspectors General (Post, August 2, 2006; Page A03)

Five Years Later: How Common Ground Led to Partisan Split (Post, July 16, 2006; Page A01)

The Bold Outlines Of a Plot: Adapted as a Comic Book, The 9/11 Commission Report Hits Home Anew (Post, July 16, 2006; Page D01)

Attacks Deeply Influenced Government Agencies (Post, July 16, 2006; Page A11)

Rethinking Embattled Tactics in Terror War: Courts, Hill and Allies Press Administration (Post, July 11, 2006; Page A01)

Architect Presents New Design for Freedom Tower: Cost Still a Concern For Proposed Building At Trade Center Site (Post, June 29, 2006; Page A03)

Transcript

Five Years Later

Post Archive: Sept. 2001

Featured Archive: Photos, Videos, Stories

Galleries

Video Features

Graphics

Audio

9/11 Commission Report

From Outlook

Al-Qaeda, Still in Business

Special Report

Salafi Islam

Goal of Isolation a Challenge

Followers of conservative sect try to allay fears that their brand of Islam fosters extremism.

Young U.S. Muslims Strive for Harmony

American Muslims debate ways to incorporate their religion into daily life, an increasingly difficult task since the attacks of Sept. 11, 2001.

Hardball Tactics in an Era of Threats

To the government, they were a terrorist risk in the Washington area. To local Muslims, they were unfairly singled out for prosecution and severe sentences.

Blunders Left FBI With Outdated Software

Because of an open-ended contract with few safeguards, SAIC reaped more than $100 million, even though its program never worked properly.

• Transcript: Post's Dan Eggen

Old-School Academy in Post-9/11 World

Curriculum for training new FBI recruits is adapting to reflect the agency's focus on terrorism.

• PHOTOS: FBI Training

An Arduous, 18-Week Path to the Badge

Five years after attacks, some security experts question whether FBI has done enough to prepare agents for the difficult challenge of countering terrorism.

FIVE YEARS LATER : Microbes Made From Scratch

Custom-Built Pathogens Raise Bioterror Fears

Custom-built pathogens raise bioterror fears as new technology is hurtling past countermeasures.

Five Years Later

The Secretive Fight Against Bioterrorism

Work at new lab could someday save thousands of lives -- or create new risks and place the U.S in violation of international treaties.

• VIDEO: Preparing for Microbes

• Special Report: Remembering 9/11