US STOCKS-Wall St falls sharply after China selloff
* China and U.S. factory activity shrank in December
* Dow makes worst start to the year since 1932
* Amazon top drag on S&P
* Indexes down: Dow 2.4 pct, S&P 2.4 pct, Nasdaq 2.8 pct (Updates to early afternoon)
By Abhiram Nandakumar
Jan 4 (Reuters) - U.S. stocks tumbled on Monday, putting the Dow on track for its worst start to a year since 1932 after weak Chinese economic data fanned fears of a global slowdown.
Surveys showed factory activity in the world's second-largest economy shrank sharply in December, sparking a 7-percent slide in Chinese shares that triggered a trading halt.
Adding to investors' worries, China's central bank fixed the yuan at a 4-1/2 year low, further weakening it against the dollar.
U.S. data sparked further concern as factory activity weakened unexpectedly in December, according to the Institute for Supply Management. Continuación...