Iraq has arrested more than 60 security force members, including 11 senior officers over two suicide bombings in Baghdad on Sunday.
Those arrested include the commanders of 15 checkpoints near where the attacks took place, close to headquarters of the governor of Baghdad and at the Ministry of Justice.
More than 150 people were killed and 500 wounded in the attack, the deadliest in Baghdad for two years.
The BBC reports the scale of the bombings has raised new questions over the competence of Iraqi security forces.
It's not clear whether those arrested are accused of negligence or collusion.
Sunday's attacks came as MPs were in deadlock over the rules governing a general election next January. Parliament has until 31 October to break the deadlock.
The BBC reports it is feared that attacks will become more frequent in the run-up to the elections.