The welfare of Chinese workers is back in the spotlight after an explosion at Shanghai-based Riteng Computer Accessory Company left 23 people in hospital with burns and another 34 with more minor injuries. Local government officials said the explosion happened on Saturday afternoon at a workshop on the fourth floor of the facility. Riteng is a subsidiary supplier to Pegatron Corp and the Chinese newspaper Yi Cai Daily reported it was in the middle of trial production of aluminum iPad 2 back panels. A separate explosion at a Foxconn factory back in Spring was attributed to poor extraction of combustible aluminum dust.