Bitcoin Tumbles After China Urges Investors To Be "Rational"

After warning about cracking down on 'virtual' capital outflows earlier in the week, Chinese officials have come out more directly against Bitcoin this morning with the country's central bank urging China's institutional and individual investors should take a rational approach to investing in virtual currencies. Bitcoin in China has legged lower on the news.
As Reuter reports,
Bitcoin prices had showed abnormal fluctuations, the Shanghai head office of the People's Bank of China (PBOC) said in a notice.