BEIJING—Apple Inc. supplier Pegatron Corp. began using facial recognition technology to screen applicants for its iPhone assembly plant, illustrating how some companies are guarding against the growing problem of underage workers making their way into factories in China.

SHANGHAI, China—Medical experts have concluded that working conditions at contract manufacturer Pegatron Corp.’s assembly plant here did not lead to the death from pneumonia of a 15-year-old boy who had lied to gain employment. The facility makes the iPhone for Apple Inc.

BEIJING—Electronics manufacturer Foxconn has admitted that student interns worked overtime and night shifts at a factory in northeast China in violation of company policy.

PARDUBICE, Czech Republic—Contract manufacturer Foxconn, which has been accused of exploiting workers at its Chinese assembly plants, is now facing similar charges at its assembly plant here.

TAIYUAN, China—Contract manufacturer Foxconn, a major supplier for Apple, has halted production at its assembly plant here after some 2,000 workers rioted.