Markets take huge dive during Obama speech
While President Obama was speaking to the country the Dow Jones Industrial Average kept going lower.
Global stock markets have extended their heavy losses, despite US President Barack Obama moving to try to reassure investors.
In his first public reaction to Standard & Poor's downgrading the US, President Obama said markets continued to regard US government debt as being the highest possible grade.
Yet despite his comments, the main Wall Street share index, the Dow Jones, extended its losses, falling 4%.
Earlier, the UK's FTSE ended down 3.4%.
Prior to President Obama's speech, the Dow had only been 2.5% lower