Iran's parliament passed a bill on Tuesday, January 7 designating all U.S. forces "terrorists"over the killing of a top Iranian military commander in a U.S. strike last week, the Mail Online says.

Qasem Soleimani, the head of the Revolutionary Guards' foreign operations arm, was killed in a U.S. drone strike outside Baghdad airport on Friday, ratcheting up tensions between the arch-foes.

Under the newly adopted bill, all U.S. forces and employees of the Pentagon and affiliated organisations, agents and commanders and those who ordered the 'martyrdom' of Soleimani were designated as terrorists.

"Any aid to these forces, including military, intelligence, financial, technical, service or logistical, will be considered as co-operation in a terrorist act," the Iranian parliament said.

Lawmakers also voted to bolster by £170million ($224 million) the coffers of the Quds Force - the foreign operations arm of Iran's Revolutionary Guards that was headed by Soleimani.

The bill was an amended version of a law adopted in April last year that declared the United States a 'state sponsor of terrorism' and its forces in the region "terror groups".