NBCNews.com | Dow Plunges 370 Points on Oil, Global Concerns NBCNews.com U.S. stocks closed sharply lower Friday on concerns including falling crude oil prices and the global response to the Federal Reserve's interest rate hike Wednesday. Options expiration also contributed to volatility. The Dow Jones industrial average ... Stocks End the Week With a Skid Stocks Dive, Dow Sees Fourth-Worst Day of 2015 Stocks tumble, Dow off 253 as oil falls below $35 |