The key Indian stock indices slumped by around 0.7% as European and US stocks declined. Metal, banking and IT stocks fell the most. Intraday volatility was high as traders rolled over positions. The markets may see further gains if the indices remain above certain support levels, but may correct otherwise. Piramal Healthcare acquired assets from BioSyntech, a medical device company, while Rabobank sold an 11% stake in YES Bank for Rs. 1,000 crore.