US President Donald Trump on Tuesday threatened Iran with unprecedented military consequences if it had placed mines in the Strait of Hormuz and failed to remove them, Anadolu reports.

“If for any reason mines were placed, and they are not removed forthwith, the military consequences to Iran will be at a level never seen before,” Trump wrote on his social media platform Truth Social.

He added that removing the mines would be “a giant step in the right direction.”

Trump, however, also noted that US has “no reports of” Tehran putting out mines in the waterway.

The warning came after a CNN report that Iran has begun laying mines in the strait. Sources told the news outlet that only a few dozen had been placed so far, but Iran still had up to 90% of its small boats and mine-laying vessels intact, leaving it capable of deploying hundreds more.