Eight people at an electric cable company in Xi'an, Shaanxi province, have been detained for providing substandard electric cables for the city's subway.

Wang Zhiwei, a legal representative of the company, knelt down and apologized to the public for providing the products, according to Xi'an Release, a WeChat account of the city government.

The company, Shaanxi Aokai Cable Co, has been shut down and its main owners as well as several managers have been detained.