A police officer tries to secure an area inside the Westgate Shopping Centre where gunmen went on a shooting spree in Nairobi

A police officer tries to secure an area inside the Westgate Shopping Centre where gunmen went on a shooting spree in Nairobi September 21, 2013. The 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. Some local television stations reported hostages had been taken, but there was no official confirmation. REUTERS/Siegfried Modola (KENYA – Tags: CIVIL UNREST)