Foxconn, the world's largest contract electronics maker, has admitted to hiring underage workers.
The company said an internal investigation found that an unspecified number of student interns aged 14-16 had been employed at one of its Chinese factories.
"Our investigation has shown that the interns in question had worked in that campus for approximately three weeks," it said in a statement (via Reuters).
"This is not only a violation of China's labor law, it is also a violation of Foxconn policy and immediate steps have been taken to return the interns in question to their educational institutions."
Foxconn is Apple's largest manufacturing partner and also makes products for Microsoft, Sony and Nintendo, including the upcoming Wii U.
Nintendo said in a statement issued to IGN that it's "in communication with Foxconn and is investigating the matter".
The platform holder added: "We take our responsibilities as a global company very seriously and are committed to an ethical policy on sourcing, manufacture and labor.
"In order to ensure the continued fulfillment of our social responsibility throughout our supply chain, we established the Nintendo CSR Procurement Guidelines in July 2008. We require that all production partners, including Foxconn, comply with these Guidelines, which are based on relevant laws, international standards and guidelines.
"If we were to find that any of our production partners did not meet our guidelines, we would require them to modify their practices according to Nintendo's policy. For more information about Nintendo's Corporate Social Responsibility report, please visit http://www.nintendo.co.jp/csr/en/index.html."