Foxconn Technology Group, the world’s largest manufacturer of electronics, said it found interns as young as 14 had worked at a facility in Yantai, northeastern China, confirming a report by an advocacy group.

A company investigation found the interns, who ranged in age from 14 to 16, had worked at the campus for about three weeks, Foxconn said in an e-mailed response to Bloomberg News on Tuesday. A ‘‘small number’’ of interns who were sent by schools and employed at Yantai over the summer were ages 14 to 16, according to a statement Monday from China Labor Watch.