The deputy commander of Iran's powerful Revolutionary Guard said Iranian forces will close the strategic Strait of Hormuz to the United States and its allies if they "threaten" the Islamic Republic, Iranian state media reported on Wednesday, May 4, according to the Associated Press.

The comments by Gen. Hossein Salami, carried on state television, follow a long history of both rhetoric and confrontation between Iran and the U.S. over the narrow strait, through which nearly a third of all oil traded by sea passes.

In his remarks, Salami said that "Americans should learn from recent historical truths," likely referring to the January capture of 10 U.S. sailors who entered Iranian waters. The sailors were released less than a day later, though state TV aired footage of the sailors on their knees with their hands on their heads, AP says.

"If the Americans and their regional allies want to pass through the Strait of Hormuz and threaten us, we will not allow any entry," Salami said, without elaborating on what he and other leaders would consider a threat.

He added: "Americans cannot make safe any part of the world."