Stock futures are plunging (SPY, SPX, DJI, IXIC)

US stock futures plunged as election results gave Donald Trump an unexpected edge.
 
Both Nasdaq and S&P 500 futures hit a limit-down, or the maximum amount by which they're permitted to fall before trading restraints kick in. They will be halted until the market opens on Wednesday.
At 12:07 a.m. ET, Dow futures are down 813 points, or 4.48%. If this plunge holds, it sets the market up for an ugly start to trading on Wednesday.
Craig Erlam, senior market analyst