Survivors and relatives of victims carry Kenya's national flags on the anniversary of last year's deadly attack on the Westgate shopping mall in Kenya's capital of Nairobi. Thomas Mukoya/Reuters /Landov hide caption

toggle caption Thomas Mukoya/Reuters /Landov

Heavy smoke rises from the Westgate Mall in Nairobi, Kenya, on Monday. The Somali militant group al-Shabab claimed responsibility for the attack. Jerome Delay/AP hide caption

toggle caption Jerome Delay/AP