US President Donald Trump announced Thursday that the United States has imposed new sanctions on Iran following the firing of missiles at two bases housing US soldiers in Iraq.

"It was ... we tightened (the sanctions) ... they were very strict, but it has now been tightened to a great extent," Trump told reporters at the White House, vowing "additional sanctions", without giving further details.

Trump sent a message to the Iranians, saying: "Maybe they want to renegotiate the nuclear deal after the presidential elections, but I advise them to do that now."

The US President said in statements yesterday, Wednesday, that his country does not want to use military force against Iran, and announced that the United States will impose additional economic sanctions on the Iranian regime, and these sanctions will continue until Iran changes its behavior, considering that the economy is the greatest deterrent.

He added that Iran funded terrorism through the money it obtained from the nuclear agreement, and there was hell in Iraq, Lebanon, Syria and other regions.

The tightening of US sanctions on Tehran comes after attacks on two military bases in Iraq that harbor American soldiers at dawn on Wednesday, in response to the assassination of the commander of the Quds Force in the Iranian Revolutionary Guard, Major General Qassim Soleimani, in Iraq last Friday.

On the other hand, Saudi Arabia condemned today, Thursday, "Iranian violations of Iraqi sovereignty," according to a statement by the Saudi Foreign Ministry stating that the kingdom "condemns these attacks and condemns their violation of Iraqi sovereignty."