ERBIL, Kurdistan Region of Iraq - Iran on Sunday threatened the US with “decisive and conclusive responses” to any attack after President Donald Trump ordered airstrikes on Houthis in Yemen and warned Tehran to stop its support to the group.

Trump said on Saturday that they had launched "decisive and powerful military action" to end the Houthi threat to Red Sea shipping, and warned Iran's support for the rebels "must end immediately”.

At least 31 people were killed and 101 others injured, “most of whom were children and women,” in the first US airstrikes on the Houthi-held Sanaa, Yemen, since Trump took office, the Houthis health ministry said on Sunday.

"Iran will not wage war, but if anyone threatens, it will give appropriate, decisive, and conclusive responses,” commander-in-chief of the Islamic Revolutionary Guard Corps (IRG) Hossein Salami said in a televised speech on Sunday. 

Salami described the Houthis as "the representative of the Yemenis”, adding the group makes its "strategic and operational decisions” independently.

During his previous term, Trump designated the IRGC as a foreign terrorist organization (FTO) in 2019.

Earlier Sunday Iran's foreign minister Abbas Araghchi urged the United States to stop the "killing of Yemeni people,” while adding that Washington had "no authority" to dictate Iran’s foreign policy.

"The United States Government has no authority, or business, dictating Iranian foreign policy," the foreign minister said on X.

 Just days after returning to the White House, Trump re-designated Yemen’s Houthis, formally known as Ansar Allah, as a “Foreign Terrorist Organization.”

The Houthis are part of the "axis of resistance" of pro-Iran groups, opposed to Israel and the United States.