VIENNA - UN nuclear watchdog chief Yukiya Amano will visit Iran on Sunday to try to advance cooperation with the agency's long-running inquiry into Tehran's nuclear activities, the IAEA said on Friday.

He will visit ahead of an Aug. 25 deadline for Iran to provide information relevant to the International Atomic Energy Agency's investigation into suspicions that Iran may have researched how to build a nuclear bomb, an accusation it denies.

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