Nov 21 (Reuters) - U.S. stocks opened flat on Thursday after mixed signals on trade and a row between Washington and Beijing over the Hong Kong protests cast doubts on the timing of a deal to end the prolonged tariff dispute.
The Dow Jones Industrial Average fell 0.81 points, or 0.00%, at the open to 27,820.28.
The S&P 500 opened higher by 0.03 points, or 0.00%, at 3,108.49. The Nasdaq Composite gained 1.14 points, or 0.01%, to 8,527.87 at the opening bell. (Reporting by Shreyashi Sanyal in Bengaluru; Editing by Shounak Dasgupta)