U.S. stock index futures dipped sharply lower Thursday evening ET as results from the British referendum continued to roll in. Dow Jones futures briefly saw an implied open down more than 400 points. After paring those losses briefly, futures then broke below an implied open down more than 700 around 12:35 a.m. ET

(5:35 a.m. London time). The S&P 500 and Nasdaq, meanwhile, were implied by futures to open down more than 5 percent. The FTSE futures also extended their losses, pointing to a roughly 8 percent fall at the U.K. stock market open. READ MORE