US STOCKS-Wall Street sinks on Black Monday's anniversary

(Updates to 4 p.m.)

NEW YORK, Oct 19 (Reuters) - Caterpillar Inc.'s warning that the housing slump was infecting the wider economy sent U.S. stocks tumbling by the most in more than two months on Friday, spooking investors on the 20th anniversary of the 1987 market crash.

Based on the latest available data, the Dow Jones industrial average .DJI was down 366.94 points, or 2.64 percent, to end unofficially at 13,519.83. The Standard & Poor's 500 Index .SPX was down 39.45 points, or 2.56 percent, to finish unofficially at 1,500.63. The Nasdaq Composite Index .IXIC was down 74.15 points, or 2.65 percent, to close unofficially at 2,725.16.

For the week, the Dow fell 4.1 percent, the S&P lost 3.9 percent and the Nasdaq shed 2.9 percent.