**Iraq has arrested more than 60 security force members, including 11 senior officers over Sunday’s twin suicide bombing in the capital Baghdad.**Those arrested include the commanders of 15 checkpoints near to where the attacks took place.
The attack in which more than 150 people were killed and 500 injured was the deadliest in Baghdad for two years.
Correspondents say the scale of the bombings raised new questions over the competence of Iraqi security forces.
The BBC’s Gabriel Gatehouse in Baghdad says it is not clear whether those arrested are accused of negligence or collusion.
However, he added, it seems to confirm what many people have suspected - that the security forces are susceptible to infiltration by insurgents or are just not up to the job.
Iraqi Foreign Minister Hoshyar Zebari said in a BBC interview that he wanted the UN to investigate external interference, accusing Syria of providing a safe haven for the bombers, which Damascus has denied.
Sunday’s co-ordinated attacks near the Baghdad governorate headquarters and the ministry came as Iraqi MPs were in deadlock over the rules governing next January’s general election.
The Iraqi parliament has until 31 October to break the deadlock, with differences between Arab and Kurdish factions centring on the disputed northern oil city of Kirkuk.