Trading in the red for the second day running, the Sensex at the Bombay Stock Exchange plunged 229 points, or 1.3 per cent, to 17,461, in early deals, today, on weak global cues. Recovering somewhat, the Sensex stood 150 points, or 0.9 per cent in the red, at 17,541, a short while ago.Stock markets in Japan, Hong Kong, China, South Korea, Singapore, Taiwan and Indonesia were down by between 0.2 per cent and 2.5 per cent, today. Over in the US, the Dow Jones Industrial Average had slumped 2 per cent, overnight, after rating agency, Standard & Poor's downgraded the ratings for Greece and Portugal, raising doubts about the Eurozone's economic stability.