U.S. troops have sharply increased patrols in Baghdad since the spike in sectarian violence, a U.S. general said Thursday, raising questions about the capabilities of Iraqi forces. A car bomb killed least 15 people in a Shiite area of the capital. At least 21 other people, including an American soldier and seven members of a Sunni family, were killed Thursday. With sectarian violence on the rise in Baghdad, the U.S. command boosted the number of armed patrols in the capital from 12,000 in February to 20,000 since the beginning of March, Maj. Gen. Rick Lynch told reporters. Full Story