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Hundreds of demonstrators supporting a powerful Iran-backed militia group in Iraq poured into a central Baghdad plaza Saturday, some burning American flags, to protest recent US sanctions against key leaders.

The protest came as Washington pointed fingers at Iranian proxy groups for a recent spate of rocket attacks against its military bases in Iraq.

The protesters burned American and Israeli flags, as well as cardboard cutouts of US President Donald Trump in Firdous Square, a central plaza that is close to where anti-government demonstrators have been camped out since 1 October.

The protest came a day after Washington blamed "Iran's proxies" for carrying out several attacks against Iraqi military bases co-located with US soldiers and warned it would take action against future attacks against American interests in Iraq.

An emblem of the US Department of Treasury was placed on the ground so protesters could walk over it, a symbolic rejection of a recent decision by the US to sanction leaders of Asaib al-Haq, a powerful Iran-backed militia group in Iraq accused of being behind deadly sniping attacks on anti-government protesters earlier in October.

On 6 December the US Treasury sanctioned leader Qais al-Khazali, his brother Laith al-Khazali, a commander in the group, and Husain Falih Aziz al-Lami, who allegedly commanded the unit of snipers.

"Today's demonstration is clear in its aim and message: It is to reject foreign intervention in Iraq's internal decisions," said Naim al-Aboudi, a lawmaker. 

"In addition to that, it is to reject the decision of the United States of America regarding popular leaders and on top of them is sheikh Qais al-Khazali. Therefore, all these people are here to rise up and condemn these decisions."

Asaib al-Haq-affiliated lawmakers also hold at least 13 seats in Iraq's Parliament.

Secretary of State Mike Pompeo blamed Iranian proxy groups in Iraq for instigating a spate of rocket attacks targeting military bases with US personnel. 

In a statement on 13 December, he warned that Washington would take "decisive" action in future attacks on American interests in the country.

"We must also use this opportunity to remind Iran’s leaders that any attacks by them, or their proxies of any identity, that harm Americans, our allies, or our interests will be answered with a decisive US response," Pompeo said in the statement. 

"Iran must respect the sovereignty of its neighbors and immediately cease its provision of lethal aid and support to third parties in Iraq and throughout the region."

On 9 December, four Katyusha rockets hit a military base near Baghdad International Airport, wounding at least six Iraqi soldiers, Iraqi security officials said. 

The area targeted by the rockets is frequented by military advisers from the US-led coalition. On 3 December, five rockets landed inside the Ain al-Asad airbase, a sprawling complex in the western Anbar desert that hosts US forces, without causing any casualties and little damage.

Agencies contributed to this report.