"The supreme leader's orders regarding the harsh punishment of Israel and revenge for the blood of martyr Ismail Haniyeh are clear and explicit ...and they will be implemented in the best possible way," said Ali Fadavi, cited by Iranian media.
Asked by reporters to respond to the Iranian remarks, White House national security spokesperson John Kirby, said the United States was ready to defend Israel with plenty of resources in the region.
"When we hear rhetoric like that we've got to take it seriously, and we do," he said.