WASHINGTON — Three people with ties to the American consulate in a drug-plagued Mexican city were killed in a drive-by shooting, a U.S. official said Sunday. Two American citizens and a spouse of a Mexican employee were killed Saturday afternoon, a U.S. official said. The official spoke only on condition of anonymity to discuss sensitive information. The White House said President Barack Obama was "deeply saddened and outraged" by the killings of those linked to the U.S.