The reports of attacks on commercial ships came after the US said it "eliminated" 16 Iranian mine-layers in the area.
Explosions are reported on two more foreign tankers in the Persian Gulf killing at least one person, port authorities say.
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.
The US president says Iran's "leaders are gone" and "we could do a lot worse". Meanwhile, the UAE says it's responding to incoming missile and drone threats from Iran.
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