The attack came nearly 24 hours after Tehran launched ballistic missiles at Iraqi bases housing American and other coalition forces in retaliation for the US killing top Iranian general Qasem Soleiman
The West Qurna-1 oilfield is jointly developed by CNPC and Exxon Mobil, with the US major as the operator
US aviation regulator FAA has also asked all US airlines to stop operating in the airspace over Iraq, Iran, and the waters of the Persian Gulf and the Gulf of Oman
It came after a deadly American drone strike on Baghdad on Friday that killed senior Iranian and Iraqi military commanders, sparking fury in both countries with Tehran vowing 'revenge'
The Iraqi Parliament on Sunday voted to expel the US troops from its territory which have been there to help the Iraq dispensation fight the Islamic State terror group
Iran and the United States have been competing for clout in Iraq since the US-led invasion in 2003 that toppled dictator Saddam Hussein
The vote comes two days after a US airstrike killed Iranian Gen. Qassem Soleimani inside Iraq, dramatically increasing regional tensions
Baghdad Green Zone houses government buildings and foreign missions
Qassem Soleimani and Abu Mahdi al-Muhandis were killed late on Thursday
Fifteen fighters were killed by the US strikes in western Iraq, while several were wounded, according to an official from the Tehran-backed Hashed al-Shaabi paramilitary force.
In late 2017, Iraq declared victory over the jihadist group, but its sleeper cells continue to carry out attacks across the country
The sudden turnaround came after one of the bloodiest days of protests yet, with 44 demonstrators killed and nearly 1,000 wounded on Thursday in Baghdad and across the south.
Iraq's capital and south have been rocked by the worst street unrest since the 2003 US-led invasion with a protest movement venting fury at the govt and its backers in neighbouring Iran
For, if democracy means rule of the people, and a demand for social equality, then we are witnessing its flowering in the most populous parts of the world
Operations at the port have been at a complete standstill since Wednesday, after protesters first blocked its entrance on Tuesday.
Ever elusive, ISIS chief Baghdadi, who was 48 at the time of his death, oversaw the murder of thousands of civilians in the name of religion
The protests in Iraq threaten to plunge the country into a new cycle of instability
Authorities did not say why the curfew was lifted
Balad air base, home to a squadron of Iraqi F-16 fighter jets, was hit with three mortar shells last week without inflicting casualties
Sistani's position at the pinnacle of the political pyramid is unprecedented for an Iraqi cleric