The domestic stock markets lost some ground after a volatile day's trading, other key Asian markets took a bigger beating, and the rupee also weakened. The Sensex at the Bombay Stock Exchange ended with a fall of 109 points, or 0.4 percent, at a 19-month low of 24,825. The Nifty at the National Stock Exchange dropped 38 points, to 7,564. The Chinese market plunged a hefty 5.3 percent, on rising investor concerns over China's slowing economy, and the movement of its currency, the yuan. Key stock indices in Hong Kong, Singapore and South Korea slumped between 1.2 percent and 2.8 percent. The rupee depreciated 18 paise, to 66.81 against the dollar, on dollar demand from banks and importers, and falling domestic equities. And global crude oil prices fell to almost 12-year lows, with Brent crude oil futures dropping to nearly 33 dollars a barrel.