Supreme Leader Ali Khamenei did not explicitly say an attack would originate from Iran, adding to speculation Tehran plans to retaliate from neighboring Iraq.

Ayatollah Ali Khamenei issued the warning on Saturday after Israel struck Iran last week, killing at least five people.

Iran’s Supreme Leader Ayatollah Ali Khamenei on Saturday issued a warning to the United States and Israel, and said that both countries will “receive a crushing response” for their actions against Iran.

Threat by supreme leader raises concerns of wider regional conflict just ahead of the American presidential election this Tuesday.

"The enemies, whether the Zionist regime or the United States of America, will definitely receive a crushing response to what they are doing," Khamenei said.

His comments came as the Pentagon said it would send additional fighter jets and destroyers to the Middle East.

Ayatollah Ali Khamenei warns Israel and the U.S. of 'a crushing response' over attacks on Iran and its allies as regional tensions rise.

Iran is planning a complex attack on Israel, which may include missiles with high-powered warheads, according to a Monday Wall Street Journal report, citing Arab and Iranian officials. The report noted that the Iranian army would also be involved in this potential round of attack.