Iranian oil officials said a fire at the southwestern Shadegan oil field has been extinguished amid claims that the blaze was an act of sabotage.

The fire broke out early on September 13 after “tampering by unknown elements,” but it was quickly brought under control, Qobad Nasseri, head of the Maroon Oil and Gas Production Company which exploits Shadegan, told state television.

The state news agency IRNA said the blaze had been extinguished.

“The damage is being evaluated but the field will return to production shortly,” Nasseri said.

The fire apparently occurred at one of around 20 active wells in Shadegan, whose estimated production capacity is about 70,000 barrels per day.

Shadegan is located in Khuzestan Province, home to Iran’s Arab minority, which has long been the scene of anti-government unrest.