BAGHDAD (AFP) - A senior Iranian diplomat was gunned down in Iraq a day after Tehran sent a peace mission to help end a standoff between US forces and militant Shiite cleric Moqtada Sadr. A high-ranking foreign ministry official who is heading the delegation said the assassination was "most certainly" linked to his visit. He sought to play down his role in efforts to avert a major battle between the US military and Sadr's Mehdi Army militia, although it was unclear if the apparent change of position was a result of the killing. An AFP correspondent saw the body of...