Who are the Iraqi pro-Iran groups fighting Washington?

After a drone attack killed three American soldiers in Jordan on Sunday near the Syrian and Iraq borders, Washington immediately accused "radical Iran-backed militant groups operating in Syria and Iraq".- Loose alliance  -
The attack in Jordan followed the same methods as the rocket and drone strikes carried out since mid-October by pro-Iran groups against American soldiers and those from the international coalition fighting the Islamic State group (IS) in Iraq and neighbouring Syria.

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