A terrorist attack in Kenya is leaving one American dead. A U.S. State Department official confirmed yesterday that a U.S. citizen was killed but gave no further details. Kenyan police say several gunmen opened fire in an assault at a luxury hotel which is part of Nairobi's 14 Riverside Drive complex, killing a total of 15 people. Somalia-based terrorist group al-Shabaab claimed responsibility for today's attack that was carried out by at least four armed men. Government officials say the area is secure but some witnesses report hearing gunfire and explosions in the Kenyan capital.