Three Americans have been kidnapped by militants in the Iraqi capital city of Baghdad.

The US embassy in Iraq confirmed that 'several' of its citizens had gone missing, after the US State Department said it was working with Iraqi authorities to locate and recover the missing Americans.

These official confirmations came after local media reports that three Americans had been kidnapped in the south of Baghdad.

The identities of the kidnapped Americans have not yet been confirmed, although CNN reports that they are contractors, citing a senior security official. Speaking to the Associated Press, an Iraqi intelligence official said the Americans were taken from their interpreter's house in the Dora area of Baghdad.

The allegiances and motivations of the kidnappers have also not been confirmed. Previous kidnappings in Iraq have been carried out by local Shia militias, criminal gangs and even Isis, but no group has yet claimed responsibility.