A huge explosion at a hypermarket in southern city of Shiraz has left 37 people wounded, the head of the medical emergency center of the province said on Saturday, June 3, 2017, Tasnim news agency reported.

Mohammad Reza Alimanesh announced that the explosion happened at 00:45 Saturday.

Fifteen of the wounded were sent to hospital after the incident, where most of them were treated as outpatients. Seven of the victims are still under treatment.

Alimanesh reiterated that no one has been killed in the incident.

The walls of the hypermarket collapsed and nearby shops and houses were damaged in the blast. The explosion was so huge it was heard in most parts of central and eastern Shiraz.

“A residential complex of eight units, where the hypermaket is located at its ground floor, was also damaged,” said Municipality of Shiraz Fire Department director, Mohammad Farrokhzadeh.

In an interview with Mehr News Agency he mentioned carelessness and disregard for safety measures as the causes of the explosion.

However, according to Shiraz Fire Department’s spokesman, Hamid Reza Gholami, the cause of the explosion is still under investigation but, “Regardless of the building’s condition, it appears that the high volume of products, including inflammable materials, stored at the place had played a role in the blast.”

Following the deadly fire at Plasco building in Tehran, in January of this year, experts and officials have been warning about the need to observe safety regulations in storing products at the supermarkets and workshops.

Plasco, the first modern office building in Tehran, built in the 1960s caught fire in the morning of January 17. Soon, the whole building was engulfed and collapsed. Twenty firefighters were reported to have been buried under the debris and later pronounced dead.

The incident shocked citizens and soon accusations were leveled against city officials for failing to enforce safety regulations.