The Shi'ite Turkmen in Iraq are on edge after officials say several bomb blasts killed at least four.<br/> <br />The bombs struck late Tuesday outside the homes of the minority group in Tuz Khurmatu, north of Baghdad.<br/> <br />The explosions came at a time of heightened tensions between the central government and ethnic Kurds over oil rights.<br/> <br />Iraq is trying to stop oil exports from Kurdistan, filing for arbitration against Turkey.<br/> <br />The Kurds have built a pipeline to Turkey that circumvents federal export infrastructure.<br/> <br />There was no immediate claim of responsibility.
