A coordinated attack involving a suicide bombing on a open-air election campaign meeting north of Baghdad killed at least 10 people on Saturday, officials said, two weeks before provincial polls.
A militant had thrown a grenade on the meeting in the restive city of Baquba, 60 kilometres (35 miles) from the Iraqi capital, before a suicide bomber blew himself up, a police colonel and a medic at the city hospital said.
At least 25 people were wounded in the attack.
The meeting was for campaign workers who supported Muthanna Ahmed Abdulwahid, a Sunni Arab candidate for the Azimun Ala al-Bina (Determined to Build) list, a small local party.
Abdulwahid was not harmed in the attack, officials said.
Iraq has been plagued by violence against election candidates ahead of provincial council polls due April 20, with 12 hopefuls already killed in the run-up to the vote, according to an AFP tally.
The polls will be the first in Iraq since 2010, and come after the withdrawal of US forces at the end of 2011.