US markets struggle amid tech sell-off and economic uncertainty

Wall Street endured its worst day in a month on Thursday as fears that tech companies are now overvalued loom large

Wall Street came under pressure on Thursday, enduring its worst day in a month as a sell-off of technology stocks intensified.

After an extraordinary rally around hopes for artificial intelligence that propelled global stock markets to record highs, fears that tech firms are now overvalued loom large.