US markets extended losses Tuesday with the Nasdaq falling more than 2% as volatility swept through global technology stocks.

South Korea's market plunge saw Samsung and SK Hynix tumble more than 12% as chipmakers drove losses across Asia.

Traders worry AI valuations have climbed too high.

AI-generated summary was reviewed by a CNN editor.

Volatility has returned to the stock market, and AI is once again the culprit.