The Sensex at the Bombay Stock Exchange fell 128 points, to 18,200 in opening trade, today, on continued selling by foreign funds, amid weak global markets. Later, the Sensex lost further ground, and stood 235 points, or 1.3 percent in the negative zone, at 18,093, in afternoon deals, a short while ago.Key stock indices in Hong Kong, China, Singapore, Taiwan, South Korea and Indonesia were down by between 0.5 percent and 1.3 percent, today, as violence in West Asia, and US unemployment data stoked concerns about global economic recovery. Japan's Nikkei 225 index plunged 1.7 percent, after a powerful earthquake struck the coast of Japan, causing a tsunami that inundated towns north of Tokyo. Over in the US, the Dow Jones Industrial Average had plunged 1.9 per cent, overnight.