The exterior of the Arak heavy water production facility in Arak, Iran
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Iran nuclear deal to enter into force on 20 January

12 January 2014 Last updated at 18:49 GMT

An interim agreement to freeze Iran's nuclear programme will enter into force on 20 January, it has been announced.

The deal, agreed in talks with world powers in November, envisages easing of some international sanctions on Tehran.

Kasra Naji reports.