(CNN) Iran has warned the US of "consequences" after Washington carried out airstrikes against an Iran-backed militia group in Iraq.

The US has "openly shown its support to terrorism and shown its negligence to the independence and national sovereignty of countries," said Iranian Foreign Ministry spokesman Abbas Mosavi , according to the state-run IRNA news agency.

"It must accept responsibility of the consequences of the illegal attacks," added Mosavi.

At least 25 people were killed and 51 wounded in the airstrikes that targeted five facilities controlled by Kataib Hezbollah in Iraq and Syria on Sunday.

Kataib Hezbollah is a militia group that falls under the Iran-backed Shiite Popular Mobilization Forces in Iraq.

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