President Trump has warned the US is “targeting” 52 Iranian sites and can strike “very fast and really hard” if Tehran hits Americans or US assets.
His comments followed the US assassination of Qasem Soleimani, a top Iranian general, during a drone strike.
Iran has vowed to avenge his killing.
Mr. Trump wrote on Twitter that Iran “is talking very boldly about targeting certain USA assets” in response to the general’s death.
He said the US has identified 52 Iranian sites, some “at a really high level & important to Iran & the Iranian culture, and people targets, and Iran itself, is going to be HIT in no time and really HARD” if Tehran strikes the US.
“The USA wants no more threats!” Trump added.
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The president said the 52 targets represented the 52 Americans held hostage in Iran for quite a year from late 1979 after they were seized at the US embassy in Tehran.
Mr. Trump’s tweets came hours after an enormous funeral procession for Soleimani was held in Baghdad, where he was killed.
Several rocket attacks shook the world shortly after the procession, including one within the Green Zone near the US embassy. Several were fired north of the Iraqi capital at Balad air station, which houses US forces.
The Iraqi military said nobody had been hurt within the attacks.
No group has yet said it had been behind the bloodshed. Pro-Iranian militants are blamed for other recent attacks.