Financial markets buckled after China escalated the trade war with the U.S., sending American stocks to the biggest drop this year and sparking a rally in global bonds. Gold surged with the yen.

The S&P 500 Index plunged 3.28% and losses in the Dow Jones Industrial Average reached 900 points before ending the session down 767 points. Apple and IBM slid at least 4% as all but 11 companies in the U.S. stock benchmark traded lower. The Cboe Volatility Index surged 36%. The 10-year Treasury yield was close to completely erasing the jump that followed President Donald Trump’s election. China’s yuan sank beyond 7 per dollar, a move that suggests the level is no longer a line in the sand for policymakers in Beijing. Oil tumbled.

Investors are starting to grasp the potential for a protracted conflict between the world’s two largest economies, with a Treasury-market recession indicator hitting the highest alert since 2007. As demand for haven assets spiked, gold made a run toward $1,500 an ounce and the Japanese yen extended its rally. Major cryptocurrencies, increasingly seen as a refuge during distressed times, climbed as Bitcoin approached $12,000. Fear gauges for the corporate bond market rose the most since March as traders rushed to hedge their positions.

“The trade war is now intensifying and it’s possible that a currency war will start as well,” said Chris Zaccarelli, chief investment officer for Independent Advisor Alliance. “Neither is good for the global economy and both will hurt equity markets.”

People’s Bank of China Governor Yi Gang said the nation won’t use exchange rates as a tool in the escalating trade dispute with the United States.

Yet for President Trump, the latest decline in the yuan, is “called ‘currency manipulation’.”

The American leader also indicated he’d like the Federal Reserve to act to counter the Chinese action. Swaps show bets the central bank will ease by 100 basis points by December 2020, a quarter-point more than what was priced in after last week’s cut.

The trade war has been a consistent catalyst for market volatility and hopes of a resolution are now being sent even further out in the horizon, according to Mike Loewengart, vice president of investment strategy at E*Trade Financial Corp. While that could continue to challenge portfolios, investors should not make the mistake of trying to time the markets amid the sell-off, he said.

“This too shall eventually pass, and bouts of volatility in recent months have shown this can happen quickly,” said Loewengart.

These are some key events to watch out for this week:

Earnings from financial giants include: UniCredit, AIG, ABN Amro Bank, Standard Bank, Japan Post Bank.

Five Asian central banks have rate decisions including India, Australia and New Zealand.

A string of Fed policy makers speak this week, including St. Louis chief James Bullard on Tuesday and Chicago’s Charles Evans a day later. All are Federal Open Market Committee voters.

Here are the main moves in markets (all sizes and scopes are on a closing basis):

STOCKS

The S&P 500 Index declined 3% to 2,844.74 as of 4 p.m. New York time.

The Stoxx Europe 600 Index decreased 2.3%.

The MSCI Asia Pacific Index dipped 2.4%.

The MSCI Emerging Market Index decreased 3.2%.

CURRENCIES

The Bloomberg Dollar Spot Index was little changed.

The euro advanced 0.8% to $1.1196.

The Japanese yen increased 0.4% to 106.17 per dollar.

BONDS

The yield on 10-year Treasuries declined 11 basis points to 1.73%.

Germany’s 10-year yield decreased two basis points to -0.52%.

Britain’s 10-year yield dipped four basis points to 0.512%.

COMMODITIES

The Bloomberg Commodity Index decreased 0.6%.

West Texas Intermediate crude declined to $54.69 a barrel.

Gold increased to $1,476.50 an ounce.