Tragedy struck a Nairobi shopping mall on Saturday when several gunmen attacked shoppers with AK-47s and grenades. Kenya's president announced there were at least 39 dead and 150 wounded. As many as 36 hostages remain inside. Witnesses say the gunmen told Muslims in the mall to stand up and leave, as only non-Muslims would be targeted. Authorities surrounded the mall to contain the situation, which the Kenyan Secretary of the Interior deemed "under control" six hours after it started. The Al-Qaida-linked militant group al-Shabab from Somalia claimed responsibility for the attack: "For long we have waged war against the Kenyans in our land, now it's time to shift the battleground and take the war to their land #Westgate," the group tweeted.