US STOCKS-Wall St ends sharply lower; S&P 500 below 1,900
* S&P 500 ends below 1,900 for first time since Sept. 29
* Amazon among biggest drags on S&P 500, Nasdaq
* Indexes down: Dow 2.2 pct, S&P 2.5 pct, Nasdaq 3.4 pct (Updates to close)
By Caroline Valetkevitch
Jan 13 (Reuters) - U.S. stocks sank on Wednesday, pushing the S&P 500 to end below 1,900 for the first time since September and extending the year's sharp selloff, on nervousness over tumbling oil prices and U.S. earnings.
Stocks started the day higher but sentiment turned negative in afternoon trading as a brief rally in beaten-down oil prices stalled.
All 10 S&P 500 sectors ended in the red, with decliners outpacing advancing issues on the NYSE by a ratio of 7.64 to 1 and by 6.35 to 1 on the Nasdaq.
"We've been in capital preservation mode since the year began and as the market has shown an inability to rally with any conviction, that's only increased the level of nervousness and that seemed to have spilled over today in a very significant way," said Michael James, managing director of equity trading at Wedbush Securities in Los Angeles.
The declines ended a two-day rebound for the S&P 500 and resumed the steep selloff that began at the start of the year amid concerns about a slowdown in China and global growth. Continuación...