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On Wednesday, Russia said it had launched 26 cruise missiles at targets in north and north-west Syria. It has reiterated comments made at the time that all reached their targets.
The news came as Nato renewed assurances to defend its allies in view of Russia's "escalation" in Syria.
Nato is boosting its response forces to be able to deploy troops speedily.
The US officials provided no details of where the missiles might have landed.
Iran's Irna news agency reported on Wednesday that an unknown flying object had crashed in the village of Ghozghapan in the Iranian province of West Azerbaijan, said to be under the missiles' flight path.
But conservative Iranian media described the reports of missiles landing in Iran as "psychological operations by the US against Moscow".