Wall Street opens down on euro zone concerns, 3M

Some weak corporate results, including from 3M Co <MMM.N> and Netflix Inc <NFLX.O>, added to the cautious tone.

The Dow Jones industrial average <.DJI> was down 52.72 points, or 0.44 percent, at 11,860.90. The Standard & Poor's 500 Index <.SPX> was down 8.54 points, or 0.68 percent, at 1,245.65. The Nasdaq Composite Index <.IXIC> was down 19.19 points, or 0.71 percent, at 2,680.25.

(Reporting by Ryan Vlastelica; Editing by Theodore d'Afflisio)