TEHRAN, Aug 2 (AFP) - 20h21 - Demonstrators ran riot in a mainly Kurdish city in Iran, attacking official buildings and setting vehicles ablaze on Monday, Kurdish leaders said Tuesday.The violence took place in Sanandaj, the main city in Iranian Kurdistan, near the border with Iraq, but no casualties were reported.

The official IRNA news agency said four cars had been set on fire and a bank attacked.

Last month, six people, including four Iranian soldiers, were killed in unrest in Kurdish areas near the Turkish border, with the with the interior ministry blaming Kurdish rebels from Turkey's Kurdistan Workers' Party (PKK).

Violent clashes also erupted lastweek in Mahabad following the death of a young man after his arrest by police, amid accusations he had been tortured.

About seven percent of Iran's population is Kurdish.