Shares around the world are in free-fall as investors see the spread of coronavirus bringing the world economy to a halt and fear leaders are not responding effectively.
At the start of US trading, shares plunged and triggered an automatic temporary suspension in trading aimed at curbing panicky selling.
When trade resumed, shares continued to fall, following European markets lower.
The initial declines came after the US restricted travel from mainland Europe.
The Dow led falls on the US indexes, dropping more than 8%.
