Equity benchmark indices climbed in early trade on Thursday but later gave up all the gains to quote lower on emergence of profit-taking amid the scheduled monthly derivatives expiry and muted trend in the US markets. The 30-share BSE Sensex climbed 118.2 points to 67,020.11 in early trade. The Nifty went up by 39.55 points to 20,136.15. Later, both the benchmark indices gave up all the early gains and were trading lower. The Sensex traded 214.84 points lower at 66,687.07 while the Nifty fell 55.80 points to 20,040.80.