The US has stepped up military activity around the Strait of Hormuz, with reconnaissance aircraft spotted near Iranian territory and additional fighter jets reportedly deployed to the region, RIA Novosti reported on Thursday, citing sources.

US reconnaissance aircraft were observed overnight near the Iranian islands of Qeshm and Hengam, while aircraft and small drones were also seen over Kermanshah Province in western Iran, according to people familiar with the matter.

Washington has also reportedly transferred 12 F-16 fighter jets from Spangdahlem Air Base in Germany to the region, the source said, adding that the increased activity could signal a possible escalation.

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