Updated at 4:30 a.m. ET
Asian and European markets tumbled Tuesday after dizzying losses on Wall Street that saw the Dow Jones industrial average shed 4.6 percent, its biggest loss in six and a half years.
In Europe, where the trading day was in full swing, the London's FTSE 100, Germany's DAX 30 and France's CAC 40 were all trending down.
In Asia, where the exchanges had all closed: