The S&P 500 fell 69 points, or 2.6 percent, to 2,570.
The S&P 500 rose 10 points, or 0.4 percent, to 2,592.
Amazon AMZN.O dropped more than 4 percent after President Donald Trump launched his latest attack over the pricing of the online retailer's deliveries through the US postal system and promised unspecified changes. Japan's Nikkei 225 Index fell by 0.5%, while China's Shanghai Composite Index slid by 0.9%. Tokyo Electron and Advantest slid 1.41 percent and 3.17 percent, respectively.
U.S. Treasury yields fell to two-month lows as investors fled sliding stocks for safety ahead of Friday's closely watched jobs report. Including pork, other meats, fruit, and steel pipes. "That mixing of issues is contributing to uncertainty", said Kristina Hooper, chief global market strategist at Invesco.
Numerous same headwinds that have weighed on stocks in recent weeks dragged down prices again on the first trading day of April.
But stocks erased those declines in afternoon trading, as some analysts said knee-jerk selling on worries that protectionist trade policies could slow global economic growth might have been overdone. Hong Kong's Hang Seng lost 0.9 percent to 29,828.46. The euro rose to $1.2283 from $1.2272. Much of Trump's criticism has come after unfavorable reporting in The Washington Post, which is owned by Amazon founder Jeff Bezos but is a separate company from Amazon.
Despite big swings in stocks, trading activity in US equity options was muted as expectations for strong corporate earnings quelled the urge to load up on contracts that benefit from a surge in market volatility.
Wall Street is also fretting about rising trade tensions, especially with China.
In particular though, over the past week President Trump has been going after one of the biggest market drivers, Amazon, which consequently sent the market tumbling.
Amazon fell more than 5% and was headed for its biggest point drop ever as it faced renewed criticism on Twitter from President Donald Trump, alleging that the e-commerce giant was responsible for the shuttering of retailers across the nation.
Lennar (LEN.N) jumped 9.3 percent to lead the percentage gainers on the S&P after the homebuilder reported quarterly revenue that beat estimates as it sold more homes at higher prices.
USA crude fell $1.81 to $63.13 per barrel and Brent was last at $67.88, down $1.46 on the day.
Follow the Dow Jones industrial average.
Specialist Thomas McArdle, left, works with traders John Panin, center, and Jeffrey Vazquez on the floor of the New York Stock Exchange, Monday, April 2, 2018.