US stock market crash: Fears Dow Jones and S&P500 are in a bubble that could burst
Are US stock markets about to crash?
The Dow Jones reached 22,179 while the S&P 500 hit 2,490 shortly before deteriorating relations between President Donald Trump and North Korea paused the rally.
But as share prices become increasingly expensive, many fear the market could be on the brink of a serious crash that brings values back down to earth.
Technology companies have seen some of the biggest jump in prices.
Facebook, Amazon, Apple, Netflix and Google - the so-called FAANGs - are among the companies that have led the charge in rising prices.
At the same time, cash into passive investments, which simply track stock indices, Exchange Traded Funds (ETFs) have also surged this year.
It's feared this rush to plough money into funds that are not actively managed is helping to inflate the bubble - and could exacerbate a crash.