Starting the expiry week of the September, the domestic markets were volatile on Monday. Later during the day, the indices plunged, owing to the global sell-off cues as well as due to FinCEN’s announcement. Sensex slid by 811.68 points or 2.09 per cent to close at 38,034.14 while Nifty declined by 283.25 points or 2.46 per cent to settle at 11,221.70.