US equity markets began the week deeply in the red as investors continued to flock to the sidelines in September amid several emerging risks for the market. The Dow Jones lost -614.41 points, or -1.8%, to 33,970.47 for its biggest one day drop since July 19. The 30-stock average was down 971 points at one point during the day. The S&P 500 fell -75 points or -1.7% to 4,357.73, posting its worst daily performance since May 12. It was a broad sell-off with each of the main 11 sectors of the benchmark registering losses. The tech-heavy Nasdaq Composite dropped -2.2% to 14,713.90. The small capitalisation Russell 2000 down -2.44%.