Syrian security forces killed at least seven people in the restive central city of Homs soon after a U.N. humanitarian assessment team left the area because the security situation was deteriorating, activists said Tuesday. Monday's bloodshed came as the overall death toll from President Bashar Assad's crackdown on the 5-month-old uprising in Syria reached 2,200, the United Nations said. The U.N.'s top human rights body voted overwhelmingly Tuesday to demand that Syria end its crackdown and cooperate with an international probe into possible crimes against humanity. The U.N. assessment team had been advised to leave Homs for security reasons when "a protest situation developed," U.N. deputy spokesman Farhan Haq said Monday in New York.