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Index plunged by more than 20% from peak
The US Nasdaq index has closed above its dotcom boom record for the first time in 15 years.
The FTSE 100 has fallen 1.3% as geopolitical tensions and yesterday's tech sell-off put fresh pressure on UK stocks.
US stock markets followed in the footsteps of the FTSE 100 on Monday, with the Nasdaq reaching its highest level for almost 15 years.