European stocks tumbled, hitting two-month lows in the process, amid worries about slowing global growth, concerns over a potential spillover of the debt crisis at China Evergrande Group and the prospect of tighter monetary policy from the Federal Reserve. US stocks plunged sharply, and the major averages all suffered their worst setbacks in several weeks, as worries about potential collapse of China's real estate firm Evergrande dented sentiment. Asian stocks fell in thin holiday trading on Monday, with markets in...