Baghdad: Officials say a car bomb has exploded near a Kurdish party's office in the northern city of Mosul, killing at least three Iraqi soldiers only days before pivotal elections.

Nobody claimed responsibility for the attack, which occurred amid rising tensions as the Kurds and mainly Sunni Arabs have been jockeying for power in Saturday's provincial elections.

The blast occurred near the offices of the Kurdish Democratic Party, or KDP, which is headed by Kurdish leader Massoud Barzani.

An army officer said Iraqi security forces became suspicious of the vehicle, which blew up as a team approached to inspect it.

The officer, who spoke on condition of anonymity because he wasn't authorised to release the information, said two soldiers and a civilian also were wounded.