The vocational school in Chengdu, China, offers courses in car repair, mechanics and electronics manufacturing, among others.
But according to a labor protection group, the school is also at the center of a cover-up involving students illegally working at a factory that builds phones for Samsung Electronics.
New York-based China Labor Watch believes it has proof of its claims, even as Samsung, the school and the factory have all disputed the allegations.
On Wednesday an official at the Chengdu Urban Construction Vocational School said: “We have sent no students to work at any factory.”
On the same day, China Labor Watch said it had gathered more evidence, and issued a new report on its findings. In August, the group had alleged that Samsung supplier HEG Technology had hired over 10 underage workers to build company products at its factory in Huizhou, China.