China's stock rally is fading after the Shanghai Composite (000001.SS) fell more than 6% and the Hang Seng (^HSI) fell more than 1% after Tuesday marked its worst day since 2008.

Yahoo Finance Senior Reporter Alexandra Canal reports more on the movement as concerns grow about China's stimulus efforts.

To watch more expert insights and analysis on the latest market action, check out more Catalysts here.

This post was written by Melanie Riehl