Sept 6 (Reuters) - Wall Street opened higher on Wednesday, but investors are expected to remain cautious amid tensions on the Korean peninsula and concerns that the Category 5 Hurricane Irma could hit the United States.
The Dow Jones Industrial Average rose 78.69 points, or 0.36 percent, to 21,832. The S&P 500 gained 7.68 points, or 0.31 percent, to 2,465.53. The Nasdaq Composite added 20.22 points, or 0.32 percent, to 6,395.80. (Reporting by Tanya Agrawal; Editing by Anil D'Silva)