The Dow fell more than 530 points Friday, a drop of around 1.6%. It was a broad-based selloff, with all 30 Dow stocks finishing in the red. Intel (INTC), Goldman Sachs (GS) and Walgreens(WBA) were among the biggest decliners. 

The Dow is now on a five-day losing streak, falling nearly 3.5% this week. That's the worst weekly pullback since late January.