Britain Marks Year Anniversary of Bombings

One year after London Underground terror attacks, memorials and security changes mark anniversary

Tanweer's video arrived at an Al-Jazeera office with clips showing Osama bin Laden and al-Qaida's No. 2 leader, Ayman al-Zawahri. The terror network has claimed responsibility for the London attacks, but authorities say it's unclear what its role was.

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