At the foreign exchange market, the rupee tumbled 34 paise, to 66.99 against the dollar in early trade. The rupee declined on strong dollar demand from banks and importers, gains in the dollar against major global currencies, and weak domestic equities.At the bourses, the Sensex at the Bombay Stock Exchange continued weak, and had declined 155 points, to 25,731 a short while ago. Earlier in the morning, the Sensex had dropped 201 points. Similarly, the Nifty at the National Stock Exchange had fallen 55 points, to 7,809 a short while ago. Stocks fell across Asia. Key stock indices in Japan, China, Hong Kong, South Korea and Singapore had posted significant losses of between 0.5 percent and 2.2 percent. Stocks slipped after the European Central Bank's stimulus package fell considerably short of market expectations.