China's safety watchdog has found nearly one in ten toys in the domestic market is unsafe, highlighting widespread quality problems in the country's poorly regulated manufacturing industry.The General Administration of Quality Supervision, Inspection and Quarantine said in a statement on Friday that twenty out of 242 toys selected randomly in eight provinces and metropolitan areas were found to be substandard. Three of the toys contained heavy metals such as lead and chromium, which can be poisonous, while other products had sharp edges and dangerous protuberances, the statement said.