No dangerous chemicals have found in blood samples from the victims of recent needle attacks in China’s Xinjiang region, state media reported. Rumors that the needles contained radioactive substances, poison or HIV proved unfounded after blood samples from 250 reported victims were examined in a Beijing laboratory. The syringe attacks began in August, a month after riots between ethnic Uighurs and Han Chinese left around 200 dead. A total of 531 people reported being attacked with hypodermic needles, with 171 showing obvious syringe marks, according to Xinjiang officials. The head of disease control at China’s Academy of Military Medical Sciences said no traces of radioactive substances, toxic chemicals, HIV, or other poisonous or viral substances were found in the checked samples.