Stock markets have tumbled across Asia and Europe today. At home, after a weak opening, the Sensex at the Bombay Stock Exchange lost considerably more ground, and had plunged 332 points, or 1.1 percent, to 31,419 a short while ago. The Nifty at the National Stock Exchange had slumped 107 points, to 9,806. Elsewhere in Asia, key stock markets in Japan, Hong Kong, South Korea and Singapore had dropped between 0.2 percent and 0.6 percent. Major European bourses in the UK, France and Germany had slumped over 1 percent, each. Global stocks fell after North Korea launched a missile over Japan, fueling worries of fresh tension between Washington and Pyongyang. And at the forex market, the rupee had weakened 13 paise, to 64.03 against the dollar in afternoon deals.