The major domestic equity indexes were sharply lower on Monday as investors fled technology stocks amid resurgent trade war worries, with key indexes trading below their 200-day moving averages and the S&P 500 closing below that pivotal technical level for the first time since Britain’s vote to leave the European Union in June 2016.

The first trading day of the second quarter began with a broad selloff concentrated in the technology and consumer discretionary sectors, as losses by Amazon, Tesla and Microsoft, among others, took center stage from retaliatory trade measures China unveiled on Sunday.

With the S&P 500 in a 10 percent correction from its record high in late January, investors were increasingly concerned a nine-year bull market might be in danger of ending.

Amazon was the largest drag on the S&P 500, down 5.2 percent, as Trump continued his twitter attacks on the online retailer.

All 11 major sectors of the S&P 500 closed lower, with the worst losses in the consumer discretionary and technology sectors, which were down 2.8 percent and 2.5 percent, respectively.

The tech-heavy Nasdaq was dragged lower by Microsoft, Intel, Apple, Facebook and Alphabet.

Shares of Tesla ended the day down 5.1 percent after the company was reported to be making 2,000 Model 3s per week, missing its 2,500 target. The company’s losses extended last weeks near 14-percent decline as investigations of a fatal California crash and a Moody’s credit downgrade weighed on the stock.

Humana closed up 4.4 percent on news it was in talks with Walmart to expand their partnership or possibly be acquired by the retailer. Walmart stock fell 3.8 percent.

Approximately 7.71 billion shares changed hands on the major domestic equity indexes, as compared to the 7.29 billion share average over the past 20 trading days.