In pictures: Nairobi Westgate Mall Siege

Reuters
A Kenyan army soldier takes cover behind a wall at Westgate Shopping Centre in Nairobi September 21, 2013. REUTERS/Noor Khamis

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Gunfire and explosions sounded for the third day from the Nairobi shopping mall where militants from Somalia's al Qaeda-linked al Shabaab movement were holding hostages after killing more than 60 people.

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