China is set to shut down pirate radio stations across many cities after an airline complained that they are interfering with its radio frequency, reports South China Morning Post.

In March, Beijing based Okay airways had complained to authorities that its in-flight navigation systems and communications with control towers were often disrupted by pirate radio broadcasts.

According to aviation experts, flight safety could be compromised if pilots lose contact with the control tower because of radio frequency being occupied.

Law enforcement agencies said they had found high-powered radio transmitters in Beijing, Tianjin, Hainan, Yunnan and Guangdong provinces.

There was even one pirate radio station found to be operating on top of a residential block in Beijing’s Chaoyang district.

The Beijing Municipal Bureau of Radio and Television had also recently seized a 2,000-watt transmitter whose signal could reach most places in the capital.

Pirate radio equipment can be easily bought online for less than 50,000 yuan ($8126).

While broadcast media is tightly controlled by the Chinese government, there is a lack of regulations controlling the sale of radio transmitters.