Iranian officials claim the US and Britain are linked to a group responsible for an explosion in a mosque last month that killed 14 people. Immediately after the April 12 explosion in the southern city of Shiraz, officials said it was caused by a bomb. But the following day, they changed the account and said it was caused by ammunition leftover from a recent military exhibition in the mosque. The official IRNA news agency on Thursday quoted Intelligence Minister Gholam Hossein Mohseni Ejehi as saying: "The group that planted the bomb had been in contact with some western countries, particularly Britain and the United States." The US and Britain have in the past denied Iranian allegations that they back groups trying to destabilize Iran.