Bitcoin extends losses, slides another 12 percent on China warning

Bitcoin plunged another 12 percent on Friday after China's central bank urged investors to take a rational approach to the digital currency, which has is on track for its heaviest two-day falls in two years. Bitcoin had gained more than 40 percent in two weeks to hit a three-year high of $1,139.89 on Wednesday, just shy of its all-time record of $1,163 on the Europe-based Bitstamp exchange. Bitcoin prices had showed abnormal fluctuations, the Shanghai head office of the People's Bank of China (P