Iran has denied reports of a grenade exploding near the convoy of President Mahmood Ahmadinejad during his visit to a western Iranian city yesterday.Iranian media reports had reported the incident, in which Ahmadinejad was unhurt. But Iran's presidential office denied there was an attack. Media advisor Ali Akbar Javanfekr told CNN that the grenade was a toy firecracker and accused international journalists of blowing the story out of proportion.Someone lobbed a homemade grenade just after the president's motorcade went by, Iranian FARS news agency had reported. The suspect was arrested, according to reports.