Wall Street fails to hold on to mini Draghi-led rally

U.S. stock indexes dropped on Thursday morning, failing to hold on to a small rally at the open sparked by ECB President Mario Draghi's comments raising hopes of further easing monetary. The European Central Bank kept its main rates on hold and Draghi said the central bank would "review and possibly reconsider" its monetary policy stance in March. Oil prices also sharply pared their losses after Draghi's comments, with Brent even edging higher, before turning back towards 12-year lows.