US President Donald Trump says a US ship "destroyed" an Iranian drone in the Strait of Hormuz on Thursday.
Trump said the drone was "threatening the safety of the ship and the ship's crew."
The US says Iran was behind a recent series of attacks on tankers in and near the Strait of Hormuz.
Iran shot down a US surveillance drone last month.
The latest US action could cause tensions between Washington and Tehran to escalate.
NHK
