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 . A curfew will be in place in cities from midnight to 5 a.m. on Saturday , Sunday and Monday , officials said . 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 boycott the election . Vote will install a 325-member parliament and form Iraq 's next government .