(Agencies)
Updated: 2007-11-20 17:22

Iran says the problems are caused by "occupying" US forces while Washington accuses Tehran of backing Shiite militants and shipping in armour-penetrating bombs for attacks on US troops. Iran has always denied the charges.

The talks have also never strayed into other contentious issues between the arch foes, namely Tehran's controversial nuclear programme.

The United States accuses Tehran of seeking nuclear weapons - a charge Iran denies and has never ruled out the possibility of military action against the Islamic republic.

Tensions have surged in the last weeks with the United States pressing for a third UN Security Council resolution imposing sanctions against Tehran and expressing frustration with the lack of progress.

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