Iraqi Prime Minister Adel Abdul Mahdi has received a phone call from US Secretary of State Mike Pompeo, his office said in a brief statement on Monday.

Abdul Mahdi's office did not specify what was discussed. Iraq denied on Sunday that its territory had been used to carry out attacks on oil facilities in Saudi Arabia, referring to an incident that knocked out more than half the Kingdom’s output.

US officials offered satellite images of the damage at the heart of the Kingdom's crucial Abqaiq oil processing plant and a key oil field, alleging the pattern of destruction suggested the attack on Saturday came from either Iraq or Iran.

Pompeo on Saturday blamed Iran for the latest attack, calling it “an unprecedented attack on the world’s energy supply.”