The BSE benchmark Sensex was trading flat at 16,881 today in the afternoon trade. In the opening trade it lost over 67 points. Similarly Nifty of National stocks exchange was trading flat at 5032.Brokers said overnight losses on the US market and weak opening on the Asian bourses mainly dampened the trading sentiments of domestic market, triggering selling by foreign funds.The Hong Kong's Hang Seng index was down 0.90 per cent in the morning trade today. The US Dow Jones Industrial Average closed 0.47 per cent lower in yesterday.