The investigations
In a live forum from Ground Zero, we examine the progress of the many investigations into the 11 September attacks.

New York recovery
In a live forum from the New York Stock Exchange, we examined how it is recovering and rebuilding after the attacks.

Experts answered your questions
In London, George Alagiah put your questions to Nathan Thomas from ABC News and in New York Kirsty Lang put your questions to Dr Faroque Khan, spokesperson of the Islamic Center of Long Island.

Global phone-in
In our interactive programme you gave your views on how the world has changed and put questions to our reporters.

Has security improved?
Security has been stepped up across the world. But lapses still happen. Has enough been done to tighten up security?

How has the world changed?
The aftermath of the terrorist attacks on 11 September 2001 reverberated around the globe. How has the world changed over the last year?

Should war on terror be extended?
The US says its war on terrorism is just beginning. Should it be extended to other countries?