Apple has put one of its key suppliers on probation for breaking its supply chain rules.

Axar.az informs that Taiwanese firm Pegatron had asked students to work night shifts and overtime at one of is plants in mainland China, the US company said.

Apple added the contractor had falsified paperwork and misclassified some of the workers, to disguise the violations.

Pegatron said that once it had become aware of the issue, it was fixed.

But Apple says it will not award the firm any new business until further "corrective actions" are completed.

Pegatron is one of a handful of companies involved in the assembly of iPhones.