NEW YORK — A stumble by Apple set off the worst rout in the stock market since July on Thursday.
Apple dropped nearly 4 percent following its announcement late Wednesday that it had pulled a software update which prevented users from making phone calls. Other technology stocks also slumped.
The selling started early and picked up strength in the afternoon. By the close of trading, all 30 big companies in the Dow Jones industrial average and the 10 industries in the Standard & Poor’s 500 index lost ground.