A labor rights group says it has uncovered “deplorable” conditions at plants in China that supply products to tech company Apple. The New York-based group China Labor Watch says a four-month investigation of 10 Apple suppliers revealed widespread abuses, including harmful working conditions and excessive overtime. The report found conditions in factories that produce cases for Apple products appeared particularly bad, with workers being exposed to loud noise and toxic chemicals. While the uproar over Apple’s suppliers has focused largely on factories owned by the manufacturer Foxconn, the group said it found violations in virtually all of Apple’s suppliers and said some companies mistreated workers more severely than Foxconn.