U.S. stock indexes, already battered by bearish Apple news, extended Thursday morning declines, and touched session lows after a report on manufacturing came in softer than expected. The Dow Jones Industrial Average DJIA, -0.02% was down 652 points, or 2.8%, at 22,695, the S&P 500 index SPX, -0.44% retreated 2.4% at 2,450, while the Nasdaq Composite Index COMP, -0.90% declined 2.8% at 6,480. The further intraday losses came after the ISM manufacturing survey showed a decline to 54.1 in December from 59.3 in the previous month. Consensus estimates were for an ISM reading of 57.9. A reading of 50 or above indicates improving conditions Losses also came amid a market unsettled by a late-Wednesday report from Apple Inc. AAPL, -0.49% , which announced a rare cut to its sales forecast, citing weakness in China's economy.