The Sunni group, notorious for its brutality, "is the product of the thoughts and acts of the US state-sponsored terrorism," said Brigadier General Massoud Jazzayeri, the deputy chief of staff of the Iranian Armed Forces, as quoted by the Fars news agency.
The United States unleashed the Islamic State on the region to create a new Middle East by fueling "uncertainty in the resistance front and the nations' awakening, [destroying] culture and civilization and resources of the regional countries' progress and [weakening] the Muslims in all fields with the help and alliance of the regional hirelings," the general underlined.
The Islamic Republic has long accused the United States of backing terrorists. Earlier this month, Iran's Supreme Leader called the United States a "supporter and plotter of terrorism."
After making major gains in the Middle East, the brutal group is estimated to control approximately 50 percent of Syria's territory and a third of Iraq despite efforts of the US-led international coalition set to destroy the IS.