At least eight people were injured, one critically, in a gas explosion at a packaging workshop in Istanbul on Saturday, city's police chief Selami Altinok said.
"It's not certain whether one person remains under debris. Rescue teams are searching meticulously," he told reporters at the blast site.
The accident was caused by either a gas leak or an exploding gas canister, Istanbul governor Huseyin Avni Mutlu said, ruling out the possibility of a terrorist attack.
On Friday, one person died and 36 were injured in a gas explosion at a bakery in the city of Denizli, southwestern Turkey, the disaster management agency said.