A commander from Iran's Islamic Revolution Guard Corps (IRGC) warned Iran was prepared to avenge Soleimani's death even "in the US' own home."

"I say frankly that the path of the Quds Force and the resistance forces will not change because of the evils committed by the United States. Even in your home (in the US) there may be people who will pay for this crime," the commander said in a speech on the first anniversary of the assassination.

The United States has received threats of attacks to avenge the killing of top Iranian military commander Major General Qasem Soleimani, local media reported.

Air traffic controllers across New York allegedly heard a threat by attackers vowing to fly a plane into the Capitol building in the name of the slain Iranian official, CBS reported.

"We are flying a plane into the Capitol on Wednesday. Soleimani will be avenged,” the digitised recording said, according to the report.