BEIJING—A fight at a northern Chinese factory campus owned by major Apple Inc. supplier Hon Hai Precision Industry Co. escalated into larger-scale unrest early Monday, according to the company and local police.

A spokesman for Hon Hai's Foxconn Technology Group arm said the situation was "under control," but added that the plant would be shut for Monday. "Our decision is to take a day off for that particular plant today," said the spokesman, Louis Woo.

An investigation into the cause of the riots, which left 10 injured, is being carried out, according to a report from China's state-run Xinhua news agency. A local Public Security Bureau officer confirmed that there were "problems" at the plant overnight and that the police were dealing with the situation.

Mr. Woo wouldn't say how many people were involved, but workers at the plant contacted over the Internet estimated several hundred to several thousand employees were involved.

The plant, located in Taiyuan in China's Shanxi province, employs 79,000 workers, Mr. Woo said. It produces electronic components for automobiles and consumer electronic components as well as moldings. It wasn't immediately clear which customers' products are made at the plant.