The blaze, which broke out late Wednesday in a newly opened shopping mall in the eastern city of Kut, is the latest fatal disaster in a country where safety regulations are often ignored.

After an initial investigation, the interior ministry said "there was clear negligence among several officials and employees" in Kut, located around 160 kilometres (100 miles) southeast of Baghdad.

It added that three local officials, including the head of civil defence in Kut, had been detained, and 17 employees suspended from work until further notice.

The Commission of Integrity, an anti-graft body, said later that security forces had detained three more officials "over the violations that led to the fire" at the Corniche Hypermarket Mall, including the head of the violations department at Kut's municipality.

Officials say their investigation is ongoing, and the number of detainees may change.

Safety standards in Iraq's construction sector are often ignored, and the country -- its infrastructure weakened by decades of conflict -- frequently experiences fatal fires and accidents.

Fires increase during the blistering summer as temperatures approach 50 degrees Celsius (122 degrees Fahrenheit).

The cause of the mall fire was not immediately known, but one survivor told AFP an air conditioner had exploded on the second floor before the five-storey building was rapidly engulfed in flames.

Several people told AFP they lost family members -- and in some cases whole families -- who had gone to shop and dine at the mall days after it opened.