SANTIAGO, Oct 30 (Reuters) - Chile's blue-chip stock index tumbled 2 percent at the close on Friday, in line with U.S. stocks as institutional investors fled the market.

The IPSA's .IPSA preliminary close was 3,304.08 points, while the all-market .IGPA closed 1.6 percent lower at 15,615.25. (Reporting by Aaron Nelsen; Writing by Louise Egan; Editing by Dan Grebler)