Pooneh Ghoddoosi from BBC PersianTV and science correspondent Jonathan Amos
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Major earthquake strikes south-east Iran

Iran has been struck by its most powerful earthquake for nearly 40 years, with tremors felt across Pakistan, India and the Middle East.

The epicentre of the 7.8 magnitude quake was near the south-east city of Khash, close to the Pakistani border, the US Geological Survey said.

Pooneh Ghoddoosi from BBC PersianTV and science correspondent Jonathan Amos describe what is know about the earthquake in Iran.