The Iranian government has denounced a mortar attack on central Tehran on Saturday night in which one person was killed and several people injured.

The People's Mujahedin said they carried out the attack which they said was directed at the residence and office of Iran's supreme leader, Ayatollah Ali Khamenei.

The government described the incident as a criminal act designed to disrupt the twenty-first anniversary celebrations of the Islamic revolution and increase tension in the run-up to general elections in two weeks' time.

From the newsroom of the BBC World Service