President Donald Trump warned Iran in a tweet not to threaten the United States again or it'll face its "official end," shortly after a rocket landed near the US Embassy in Baghdad overnight.
Trump's tweet comes after he seemingly sought to soften his tone on Iran following days of heightened tension sparked by a sudden deployment of bombers and an aircraft carrier to the Persian Gulf over still-unspecified threats.
"If Iran wants to fight, that will be the official end of Iran," Trump tweeted. "Never threaten the United States again!"
Iran's Foreign Minister Mohammad Javad Zarif responded by tweeting that Trump's "genocidal taunts" will not "end Iran."
"Iranians have stood tall for millennia while aggressors all gone. Economic terrorism and genocidal taunts won't 'end Iran'," Zarif added.
Tensions in the Gulf are due to Trump's decision a year ago to pull America out of Teheran's nuclear deal with world powers.
Trump's latest tweet came just hours after a Katyusha rocket fell in Baghdad's heavily fortified Green Zone, less than a mile from the US Embassy, causing no injuries.
Iraqi military spokesman Brig Gen Yahya Rasoul said that the rocket was believed to have been fired from east Baghdad. The area is home to Iran-backed Shiite militias.
Trump had campaigned to pull the US from the 2015 nuclear accord, which saw Iran agree to limit its enrichment of uranium in exchange for the lifting of economic sanctions. Since the withdrawal, the US has reimposed previous sanctions and come up with new ones.
Trump called the nuclear deal a "horror show."
"I just don't want them to have nuclear weapons and they can't be threatening us," he said.