An Iranian court on Wednesday issued a $312.9 million judgment against the United States over a 2017 Islamic State-claimed attack on Tehran, authorities said, according to The Associated Press.

Iran's state-run IRNA news agency, in reporting the decision, offered no direct evidence to support the court's allegation that American officials had any part in the June 2017 attack that killed at least 18 people and wounded 50 others. The assault saw gunmen attack Ayatollah Ruhollah Khomeini’s mausoleum and the country's parliament, starting an hours long siege.

The court ruling comes after the United Nations' highest court in March rejected Tehran’s legal bid to free up some $2 billion in Iranian Central Bank assets frozen by US authorities. Meanwhile, US judges have issued rulings that call for billions of dollars to be paid by Iran over attacks linked to Tehran.

The US State Department did not immediately respond to a request for comment on the ruling in Iran.

The IRNA report described those named in the lawsuit as including the US government, former Presidents George W. Bush and Barack Obama, the CIA, the American military's Central Command, the Treasury and others.

It said the case before Branch 55 of the Tehran Court of Justice came from the families of three people killed in the June 2017 attack.

ISIS overran large swathes of Syria and neighboring Iraq in 2014, proclaiming a "caliphate" in land it controlled.

Several military offensives, including those backed by the US-led international coalition, have since seen ISIS lose most areas it once controlled, including the loss of their de facto capital in Raqqa, Syria.

However, ISIS sleeper calls remain in the area continue to carry out deadly attacks in Syria and Iraq.

The June 2017 attack in Tehran marked the first time ISIS terrorists could penetrate tightly controlled Iran and carry out of a massive assault.