The regular round of talks between Tehran and the six powers on Iranian nuclear program kicked off on Monday in Vienna, spokesperson for EU High Representative said.

EU High Representative Catherine Ashton and Iranian Foreign Minister Javad Zarif met for a working lunch ahead of the talks, Micahel Mann tweeted.

Last week Iran and the six powers agreed to lift sanctions against Tehran.

Ahead of talks, Tehran held bilateral consultations with the U.S., France, Russia and Germany.