Turkish security forces on Sunday seized nearly 41,000 sub-standard masks being produced in an unhygienic environment.
Anti-smuggling teams carried out the operation in the southern province of Adana amid a surge in demand for protective gear due to the coronavirus outbreak.
Police raided a depot that was operating without a permit in the Yuregir district.
A suspect who is a Syrian national was briefly detained.
Turkey has registered 23,934 coronavirus cases and the death toll stands at 501. A total of 786 people have fully recovered following treatment.
Since appearing in Wuhan, China, last December, the novel coronavirus