HARARE, Zimbabwe - U.S. diplomats and British colleagues were attacked as they tried to investigate political violence in Zimbabwe, American officials said Thursday. The U.S. ambassador reportedly blamed the incident on President Robert Mugabe's government. "Police put up a roadblock, stopped the vehicles, slashed the tires, reached in and grabbed telephones from my personnel, and the war veterans (Mugabe's supporters) threatened to burn the vehicles with my people inside unless they got out and accompanied police to a station nearby," Reuters quoted U.S. Ambassador James McGee as saying. McGee said he believes the orders of intimidation are "coming directly from...