The Dow opened marginally down on yesterday's 8,469 close but immediately dropped further to 8,329.
General Motors led the market drop, falling 12.17% on opening, to 14 cents.
Meanwhile, the FTSE 100 fell through the morning and early afternoon, reaching a low of 4,333 shortly after 2pm although it rallied to 4,363 by 3pm.
Mining companies Eurasian Natural Resources, Xstrata and Rio Tinto made up three of the five biggest losers, all down more than 10%. Financial stocks also dragged on the index including L&G as investors were unimpressed with the insurer's results and plans to cut hundreds of staff.
Caterer Compass Group had the best performing shares, up 6.46% to 21.5p on the back of a 41% rise in half-year profits.
What made financial headlines over the weekend?
Went into administration April 2018
Threat of legal action looms over Woodford IM
View from the front row