HARARE, Zimbabwe (AP) - Supporters of Zimbabwean President Robert Mugabe used axes, clubs and stones to attack a meeting of opposition politicians Thursday, injuring several people, opposition party officials said. Morgan Tsvangirai, head of the Movement for Democratic Change, took shelter in his armor-protected car and was not injured, they said. The violence erupted in Mvurwi, about 60 miles north of Harare, the capital, as about 400 opposition leaders and supporters discussed preparations for parliamentary elections next March. Witnesses said about 200 ruling party ZANU-PF militants attacked the meeting. "It is an exaggeration to say it was an assassination attempt...