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TEHRAN (FNA)- Iran's Islamic Revolution Guards Corps started heavy ballistic missile attacks on US Ein Al-Assad airbase in Southwestern Iraq near the border with Syria in retaliation for the assassination of IRGC Qods Force Commander Lieutenant General Qassem Soleimani earlier on Wednesday.

Ein Al-Assad is an airbase with a 4km runway at 188m altitude from sea levels, which is the main and the largest US airbase in Iraq.

The IRGC issued a statement saying it has fired tens of ground-to-ground missiles at "the airbase occupied by the terrorist and aggressive army of the United States known as Ein Al-Assad" in reprisal for the martyrdom of IRGC Qods Force Commaner Lieutenant General Qassem Soleimani.

The IRGC warned the US to avoid retaliating the Wednesday attack or else "it will face a more painful and crushing response".

The IRGC Statement also warned "all the US allied states where the terrorist army has a base, any territory that becomes the origin of any hostile and aggressive action against the Islamic Republic of Iran in any way will be targeted".

"We believe that the Zionist regime by no means stands aside from the criminal US regime in these crimes."

The IRGC also called on the American nation to pressure the White House to pull their troops our of the region to avoid further damage and not allow the US rulers to endager the lives of their military men through increasing hatred.

Lieutenant General Soleimani was martyred in a targeted assassination attack by the US drones at Baghdad International Airport early on Friday morning.

The airstrike also martyred Abu Mahdi al-Muhandis, deputy commander of Iraq's Popular Mobilization Forces (PMF), or Hashad al-Shaabi. The PMF media arm said the two were martyred in an American airstrike that targeted their vehicle on the road to the airport.

Five Iranian and five Iraqi militaries were martyred by missiles fired by the US drone at Baghdad International Airport.

The Pentagon confirmed the attack in a statement.

The attack came amid tensions that started by the US attack on PMF units that killed 28 Iraqi popular forces. A day later, Iraqi people attacked the US embassy in Baghdad. On Wednesday President Donald Trump ordered about 750 US soldiers deployed to the Middle East.

US officials earlier suggested they were to engage in further retaliatory attacks in Iraq.

The developments also represent a major downturn in Iraq-US relations that could further undermine US influence in the region and American troops in Iraq and weaken Washington’s hand in its pressure campaign against Iran.

US President Donald Trump was vacationing on his estate in Palm Beach, Florida, but sent out a tweet of an American flag.

The attack represents a dramatic escalation by the US toward Iran after months of tensions. The tensions take root in Trump’s decision in May 2018 to withdraw the US from Iran’s nuclear deal with world powers, struck under his predecessor.