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At least 22 people have been killed in an attack on an open-air election campaign rally north of Baghdad.

According to the Reuters news agency, police and hospital workers said the attack began when a grenade was thrown into the meeting. A suicide bomber then blew himself up.

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Supporters of Muthanna Ahmed Abdulwahid, a Sunni Arab candidate for the Azimun Ala al-Bina (Determined to Build) party, was holding the gathering.

The attack on the meeting in the restive city of Baquba comes two weeks before provincial polls.

Dozens more were wounded.

Based on reporting by Reuters and AFP