However, restrictions have been imposed on Uyghur Islamic practices because the Chinese government has attempted to link Islamic beliefs with terrorist activities since 2001. Numerous events have led the Chinese government to crack down on most displays of Islamic piety among Uyghurs, including the wearing of veils and long beards. The Ghulja Incident and the July 2009 Ürümqi riots were both caused by abusive treatment of Uyghur Muslims within Chinese society, and they resulted in even more extreme government crackdowns.