HARARE (AFP) – Zimbabwe Prime Minister Morgan Tsvangirai's party on Saturday pushed for an independent probe of the car crash that killed his wife and injured him, as an official said a US aid truck was involved. Tsvangirai, a longtime rival of President Robert Mugabe who recently became prime minister in a unity government aimed at ending months of political turmoil, remained in stable condition in hospital after the crash on Friday. "Police are making their own investigation, we are also making our own," said Finance Minister Tendai Biti, also the number two leader of Tsvangirai's Movement for Democratic Change...