Swedish fast-fashion retailer Hennes & Mauritz said…that some of its clothing was produced in a Cambodia factory where 23 people were injured in an accident on its premises...The Stockholm-based retailer also said its orders had been placed at the factory without its knowledge, highlighting the lack of control some of the world's biggest brands may have over their supply chains...23 workers were injured when a rest area outside the subcontracted factory operated by Hong Kong's Top World Garment (Cambodia)...collapsed and fell into a pond.…Workers' rights activists condemn such subcontracting because they say it makes it harder to track the origin of garments…[mentions Walmart, Tazreen Fashions, Sears Holdings]