Pakistani protesters burn tires during a demonstration against the release of Raymond Allen Davis, an American CIA contractor, on Wednesday, March 16, 2011, in Lahore, Pakistan. Mr. Davis, who said he shot and killed two Pakistani men in self-defense, was released from prison after the United States paid "blood money" to the families of the victims, apparently defusing what had been a major row between Washington and Islamabad, Pakistani officials said. (AP Photo/K.M. Chaudary)