The FBI has announced it will not
recommend criminal charges against Hillary Clinton over her use of
private email while she was secretary of state.
The decision ends the legal uncertainty that has dogged the Clinton campaign. However, Mr Comey was highly critical of Mrs Clinton and her staff.
"Although we did not find clear evidence that Secretary Clinton or her colleagues intended to violate laws governing the handling of classified information," Mr Comey said.
"There is evidence that they were extremely careless in their handling of very sensitive, highly classified information." Republican presidential hopeful Donald Trump called the decision "very unfair" and said Mrs Clinton's use of private email compromised national security.
Mrs Clinton said she set up the email address for reasons of convenience, because it was easier to do everything from one device than to have several phones or tablets.
Mrs Clinton had previously said she did not knowingly send any classified material from her account.
However, FBI found more than 100 emails that were classified at the time on Mrs Clinton's servers in multiple email chains.