A US Navy destroyer has fired three warning shots at Iranian patrol boats in the Strait of Hormuz, the entrance to the Persian Gulf.
Officials say four fast-attack boats were closing on the USS Mahan at high speed and ignored attempts to make contact.
The Week
Escape your echo chamber. Get the facts behind the news, plus analysis from multiple perspectives.
Sign up for The Week's Free Newsletters
From our morning news briefing to a weekly Good News Newsletter, get the best of The Week delivered directly to your inbox.
From our morning news briefing to a weekly Good News Newsletter, get the best of The Week delivered directly to your inbox.
Reuters reports the Mahan "fired flares" while a "US Navy helicopter also dropped a smoke float before the warning shots" in an attempt to warn the Iranian vessels away.
Pentagon spokesman Captain Jeff Davis described the actions of the Iranian vessels as "unsafe and unprofessional".
He said: "They were approaching at a high level of speed with weapons manned and disregarding repeated warnings.
"It's somewhat out of character, recently anyway, from what we've seen out of Iran."
Davis said there had been a total of 35 encounters "assessed to be unsafe and unprofessional" in 2016.
"The vast majority of those were in the first half of 2016," he added.
White House press secretary Josh Earnest said: "These types of actions are certainly concerning and certainly risk escalating tensions."
The incident is the latest tense encounter between the two countries in and over waters near Iran in recent months, says CNN. "These brushes have included Iranian rocket launches, drones flying over US vessels and the capture of US sailors," it adds.
The Guardian says the incident "could be seen as Iranian probing amid uncertainty over how quickly and severely Trump will turn away from Obama's policy of engaging diplomatically with Iran".
In September 2016, Trump said any Iranian vessels that harass the US Navy in the Gulf would be "shot out of the water".
-
Out of office: microretirement is trending in the workplaceThe explainer Long vacations are the new way to beat burnout
-
Will California tax its billionaires?Talking Points Proposed one-time levy would shore up education, Medicaid
-
Blue Origin launches Mars probes in NASA debutSpeed Read The New Glenn rocket is carrying small twin spacecraft toward Mars as part of NASA’s Escapade mission
-
Why these Iraqi elections are so importantThe Explainer The US and Israel are increasingly pressuring Baghdad to tackle Iran-backed militants, while weakened Iran sees Iraq as a vital remaining ally
-
Nigeria confused by Trump invasion threatSpeed Read Trump has claimed the country is persecuting Christians
-
Sanae Takaichi: Japan’s Iron Lady set to be the country’s first woman prime ministerIn the Spotlight Takaichi is a member of Japan’s conservative, nationalist Liberal Democratic Party
-
Russia is ‘helping China’ prepare for an invasion of TaiwanIn the Spotlight Russia is reportedly allowing China access to military training
-
Interpol arrests hundreds in Africa-wide sextortion crackdownIN THE SPOTLIGHT A series of stings disrupts major cybercrime operations as law enforcement estimates millions in losses from schemes designed to prey on lonely users
-
'Axis of upheaval': will China summit cement new world order?Today's Big Question Xi calls on anti-US alliance to cooperate in new China-led global system – but fault lines remain
-
China is silently expanding its influence in American citiesUnder the Radar New York City and San Francisco, among others, have reportedly been targeted
-
How China uses 'dark fleets' to circumvent trade sanctionsThe Explainer The fleets are used to smuggle goods like oil and fish
