President Donald Trump on Sunday morning announced the United States will implement a naval blockade of the Strait of Hormuz after negotiations between Washington and Iran to end the war faltered.

Trump said the blockade would begin shortly and promised that any Iranian who fires at the U.S. or at peaceful vessels “will be BLOWN TO HELL!” as the strait is demined. The president said other countries will also be involved in the blockade in a move he said is designed to keep Iran from “illegally” charging fees to vessels looking to pass through the Strait of Hormuz in exchange for safe passage.