President Donald Trump says Iran will “be blown off the face of the earth” if U.S. vessels guiding ships through the Strait of Hormuz are attacked, escalating his threats to eliminate Iranian civilization as the countries test a tenuous ceasefire during the weeks-long war.

U.S. military officials said Iran launched missiles, drones and small boats at ships sailing through the passage with U.S. support on Monday. Six small Iranian boats were targeting civilian vessels, according to officials.

If Iranians continue to target commercial ships during the so-called Project Freedom escort operation, the Iranian regime will “be blown off the face of the earth,” Trump told Fox News correspondent Trey Yingst on Monday.

Trump’s latest rhetoric follows last month’s threats that a “whole civilization will die” in Iran “never to be brought back again” if the nation did not agree to a ceasefire deal and reopen the Strait, whose effective closure has choked off global oil supplies and surged barrel prices.

“Iran has taken some shots at unrelated Nations with respect to the Ship Movement, PROJECT FREEDOM, including a South Korean Cargo Ship,” Trump wrote on Truth Social on Monday as he suggested South Korea should “come and join the mission.”

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