While reports are unclear, with some saying the riot began as a dispute between workers on different production lines, while others say that the riot broke out after a security guard struck a worker at approximately 10 p.m. local time.
Unconfirmed photographs and video purportedly from the factory showed broken windows as well as riot police and large groups of workers milling about. The embedded YouTube video is one of the uploaded clips. The Taiyuan Foxconn plant, located in central China, employs about 79,000 workers.
Foxconn has declined to state whether or not the Taiyuan facility made components for or builds the Apple iPhone 5, which went on sale last week. However, an August undercover report from a Chinese news site claimed that the site builds the back casing of the iPhone 5. Foxconn employs about 1.1 million workers in China.
In March workers at the same site went on strike over the failure of the company to fulfill a promised pay raise.
In June, a riot broke out at a Foxconn facility in Chengdu, but that was apparently due to an dispute between workers and a local restaurant owner.