Smut factory workers on break

Working excessive overtime without a single day off during the week, living together in crowded dormitories and standing so long that their legs swell and they can hardly walk after a 24-hour shift.

These are the lives some employees claim they live at Apple's manufacturing centres in China, where the firm's suppliers allegedly wrongly dispose of hazardous waste and produce improper records.

Almost 140 workers at a supplier in China were injured two years ago using a poisonous chemical to clean iPhone screens - and two explosions last year killed four people while injuring more than 75.