NEW : 12 people dead and dozens wounded in series of bomb attacks . Attacks coincide with early voting in Iraq 's national election . Security is tight after insurgent groups vowed to boycott the election . Vote will install a 325-member parliament and form Iraq 's next government .
NEW : 12 people dead and dozens wounded in series of bomb attacks . Attacks coincide with early voting in Iraq 's national election . Security is tight after insurgent groups vowed to disrupt the vote . Vote will install a 325-member parliament and select Iraq 's next government .