Wall St falls after strong week; Pfizer and Allergan drag
The Dow Jones industrial average fell 31.13 points, or 0.17 percent, to 17,792.68, the SP 500 lost 2.58 points, or 0.12 percent, to 2,086.59 and the Nasdaq Composite dropped 2.44 points, or 0.05 percent, to 5,102.48.