In pictures: Nairobi Westgate Mall Siege

A mother and her children hide from gunmen at Westgate Shopping Centre in Nairobi September 21, 2013. Gunmen stormed the shopping mall in Nairobi on Saturday killing at least 20 people in what Kenya's government said could be a terrorist attack, and sending scores fleeing into shops, a cinema and onto the streets in search of safety. Sporadic gun shots could be heard hours after the assault started as soldiers surrounded the mall and police and soldiers combed the building, hunting down the attackers shop by shop. REUTERS/Siegfried Modola

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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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