U.S. stocks declined sharply for a second session Friday, with the Dow Jones Industrial Average on track for its first weekly drop in four, after JPMorgan Chase posted disappointing earnings and Gap reported and a decline in sales. “So far it does not appear to be so much fundamental as a turn in sentiment,” said Russ Koesterich, BlackRock’s global chief investment strategist, who attributes the recent selloff in high-flying shares to “forced liquidation by hedge funds.” More