A fight between workers and quality-control inspectors on Friday resulted in some injuries and people being taken to the hospital, China Labor Watch said.

"They have such high expectations for these products, even if you raise the demands a little bit it makes a huge difference to the pressure on the workers," Li Qiang, China Labor Watch's executive director, said in an interview.

He last heard from workers at the plant late Friday night and the strike had not been resolved, he said.