Dow, S&P 500 futures about 1.5% lower after Greek 'No' vote

U.S. stock futures opened sharply lower Sunday night after the Greek people voted resoundingly to reject proposals from their European creditors.

S&P 500 futures fell 1.5 percent in early trading after 6 p.m. ET (2200 GMT).

Once the magnitude of the Greek vote became clear, the euro began falling against other major currencies, and European stock futures sank (led by a 4 percent decline for the benchmark German DAX).

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