PARIS, France (AFP) — Clear international rules govern investigations into air crashes, but in the case of Wednesday’s Ukrainian passenger jet disaster in Iran they could fall victim to heightened tensions between Tehran and Washington. The Ukraine International Airlines Boeing 737-800 crashed less than three minutes after taking off from Tehran’s airport, killing 176 people, mostly Iranians and Canadians. Tehran has already indicated it will not hand over to Americans the recovered flight recorders, the […]