Bulletin world briefing: Iran’s ‘letter to the American people’ and Russia blamed for Estonia attack

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1. Iran pens ‘letter to the American people’ as currency falls to record low
2. Estonia says Russia behind arson attack as Nato allies offer support
3. Mexico hit with life-threatening winds after Hurricane Polo makes landfall
4. Vietnam accused of abducting Australian and Norwegian activists
5. Greek poem dating back 1,700 years discovered in ancient Egyptian tomb

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