Mystery of the cancer cluster killing Chinese workers at factory that makes new iPhone 6

Five workers at the iPhone factory in Shenzhen, China, have died of leukaemia, including staff in their early twenties - an age when cases of the blood cancer are rare.
Families of the ill and deceased say the cancer may have been caused by chemicals in cleaning products. Two million phones are made every week by 230,000 migrant workers at the factory.

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