The Iraqi authorities have issued an arrest warrant for Sunni Muslim Tareq al-Hashemi, the Euronews TV channel reports on Tuesday.
He is under investigation for suspected links to assassinations and bombings.
Observers say the issuing of the warrant is likely to fuel sectarian tensions in Iraq, only days after the last US troops withdrew from the country.
They also say there is now a risk that a power-sharing deal between rival Shi’ite, Sunni and Kurdish blocs could unravel.
Hashemi claims that he is innocent.
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