BAGHDADinfo-icon: Iraqinfo-icon's government warned on Monday that its relations with the United Statesinfo-icon were at risk after deadly American air strikes against a pro-Iraninfo-icon group sparked anger on the streets with protesters torching USinfo-icon flags.

At least 25 fighters were killed in Sunday night's attacks which saw US planes hit several bases belonging to the Hezbollahinfo-icon Brigades, one of the most radical factions of Hashed al-Shaabi, a Tehraninfo-icon-backed Iraqi paramilitary coalition.

It came at a time when Iraq is caught up in mounting tensions between its allies Tehran and Washington and grappling with huge street protests against corruptioninfo-icon but also against Iran's growing political influence in the country.

The strikes "killed 25 and wounded 51, including commanders and fighters, and the toll could yet rise," said the Hashed, which holds major sway in Iraq.

Victims were still being pulled from the rubble of bases near Al-Qaim, an Iraqi district bordering Syriainfo-icon, on Monday, it said.

Iraq's government, acting in a caretaker capacity following the resignation of prime minister Abdel Abdel Mahdi in the face of street protests, denounced the strikes and warned they could affect ties with Washington "American forces acted on their political priorities, not those of the Iraqis," a statement said, adding that such strikes "violate the sovereignty of Iraq".

The attacks "force Iraq to review its relations and its security, political and legal framework to protect its sovereignty", the government added.

The warning came as demonstrators torched US flags in Basrainfo-icon and Najaf and in Kirkuk north of Baghdad while lawmakers called for US troops to be booted out of Iraq.

Parliament's deputy speaker, part of influential cleric Moqtada Sadr's bloc, called on the Iraqi state to "take all necessary measures" in the face of the US attacks.

Dozens of lawmakers called on the government to review an agreement allowing the deployment of 5,200 US soldiers in the country, saying the strikes amount to a violation that renders the pact obsolete.

US Assistant Secretary of State David Schenker said the strikes were a message to Iran after months of "restraint" by the administration of President Donald Trumpinfo-icon.

Schenker said the strikes were in retaliation for the death of a US civilian contractor in Kirkuk in a Hezbollah Brigades rocket attack.

"We thought it important to hit a significant target set to send a very clear message to them about how serious we take American lives," Schenker told reporters.

"This was a response that was serious, but was, I think in many ways, proportionate," he said.

"We don't want an escalation here, we want a de-escalation." Tensions have soared between the United States and Iran since Washington pulled out of a multilateral nuclear agreement with Tehran last year and imposed crippling sanctions Iraqi leaders fear their country could become a battleground between Tehran and Washington.

The office of Grand Ayatollah Ali Sistani, who is highly revered by Iraq's Shiainfo-icon majority, denounced the attacks.

"The authorities must prevent Iraq being used as a place for the settling of accounts," it said in reference to US-Iran tensions.