The Sensex at the Bombay Stock Exchange climbed 117 points in opening trade, this morning, on bargain-hunting by investors, after better-than-expected third quarter earnings by some corporates. But the Sensex later surrendered all its initial gains, on broad-based selling, to stand 161 points, or 0.9 percent in the red, at 18,808, in afternoon trade, a short while ago. But other Asian markets clocked gains, after US central bank policymakers voted unanimously to maintain a 600-billion dollar bond-buying plan to fuel economic recovery. The key benchmark indices in Japan, China, Singapore, Hong Kong, Indonesia, South Korea and Taiwan were up by between 0.1 percent and 1 percent.