BLAST NEAR NUKE PLANT There is confusion over the cause of a blast near Iran's only nuclear plant. It is thought a fuel tank dropped from a plane may have been the cause of the explosion. State TV initially said an unknown aircraft fired a missile in a deserted area near Dailam. "A powerful explosion was heard this morning on the outskirts of Dailam in the Bushehr province," state TV said. "Witnesses said that the missile was fired from an unknown plane 20 km (12 miles) from the city." Other witnesses said they heard an explosion and saw a plane overhead. The nuclear plant, being built with Russian help, is 90 miles from the city. Local officials have been despatched to the site to identify the cause of the explosion, according to Arab-language television Al-Alam. Iranian Interior Ministry spokesman said he could not confirm reports anti-aircraft fire had been shot off near the plant. Israel said it was not involved and Russia said there had been no attack on the plant. Oil prices rose sharply after news of the explosion.