Guardian: Tehran is struggling to play down reports of an alleged bomb attack on President Mahmoud Ahmadinejad - which raced around the world - as it appeared an error in translation may have transformed a firecracker into a grenade. The security alert was triggered in the city of Hamedan, where the hardliner had arrived to make a speech. As he drove from the airport to the city's football stadium a teenager threw a large cherry bomb at a minibus carrying journalists at the back of Ahmadinejad's convoy. The teenager was subsequently arrested.