It follows three previous attempts on Mr Ahmadinejad, one in 2005 and two in 2008. The attempt in 2005 was the most serious with his driver and a bodyguard dying after his car was ambushed by seperatist fighters near the Pakistan border. Mr Ahmadinejad said a change of route had twharted an assassination plot during a visit to Iraq in 2008. A few months later his aides said they had switched hotels during the World Food Summit in Rome after detecting rising lethal levels of radiation in his room.