The reports of attacks on commercial ships came after the US said it "eliminated" 16 Iranian mine-layers in the area. Elsewhere, two drones were downed near Dubai airport.
Comments come amid speculation over the health and whereabouts of Khamenei, who has not been seen in public since he succeeded his father How have you been affected by the latest Middle East events?
The US says the ships were targeted in the Strait of Hormuz - a key shipping route. In Dubai, authorities say the airport is operating normally after two drones were downed in the area.
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