Dow Jones industrial average futures opened down about 80 points and shed as much as about 360 points before holding at about 366 points lower.

Read MoreDow futures tumble as Street preps for meltdown

S&P 500 futures opened down 12.50 points and fell as much as about 40 points before holding at about 39points lower. Nasdaq futures fell 33 points at the open before falling as much as 144 points and were last down about 35 points.

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