NEW : Prime Minister Morgan Tsvangirai in stable condition , sources say . Analyst : Crash could threaten fragile coalition government with President Mills . McDonald , now an attorney with the Washington law firm Baker Hostetler , urged a full investigation by outside authorities . Head - on collision likely to raise suspicions of foul play , analysts say . Ex - U.S. diplomat says other Mugabe foes have died in similar crashes .
NEW : Prime Minister Morgan Tsvangirai in stable condition , sources say . Analyst : Crash could threaten fragile coalition government with President Mills . Head - on collision likely to raise suspicions of foul play , analysts say . Ex - U.S. diplomat says other Mugabe foes have died in similar crashes .