US stocks turn lower again as a wild trading week continues

. (AP) — Stocks gave up an early gain and moved steadily lower all day, erasing nearly all of a rally from a day earlier and extending their losses for the week. The S&P 500 gave up 1.8% Thursday after having been up 0.8% in the early going. Technology shares once again led the way lower, and the Nasdaq fell 2%. The slide follows a wild stretch where the S&P 500 careened from its worst three-day slump since June to its best day in nearly three months. Apple, Microsoft and chipmaker