Zimbabwe's opposition presidential candidate was allowed to leave a police station about two hours after being ordered to drive there, but told he could not resume campaigning Friday. Morgan Tsvangirai had been trying to campaign around Bulawayo, Zimbabwe's second largest city. He was stopped at a roadblock and ordered to go to a police station about 30 miles from Bulawayo. Later, he and reporters with him were allowed to leave the station. They drove back to Bulawayo under police escort. Tsvangirai's campaign to unseat Robert Mugabe has been hobbled by violence and intimidation.