New York (CNN) — Wall Street kicked off the week on a sour note, with stocks and bitcoin tumbling as a risk-off attitude spread through markets.

The Dow closed lower by 557 points, or 1.18%. The broader S&P 500 fell 0.92%. The Nasdaq Composite fell 0.84%.

Wall Street’s fear gauge, the VIX, jumped 13%. CNN’s Fear and Greed index traded in “extreme fear” and hit its lowest level since early April.

Stocks fell on Monday as investors’ nerves intensified ahead of two key events this week: Nvidia ( NVDA ), the star of the artificial intelligence boom, is set to report earnings on Wednesday. And on Thursday, the September jobs report — long delayed because of the government shutdown — is set to be released.

These two events will provide more insight about the issues that are “top of mind

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