Hillary Clinton has said goodbye to her colleagues in her farewell address to state department staff on her last day as the US' top diplomat.
In her address, Clinton acknowledged the attack on the US embassy in Turkey.
She pointed out that 'we live in very complex and dangerous times, as we saw again just at our embassy in Ankara, where we were attacked."
But she said she was 'more optimistic' now than when she took up her post in 2009, the BBC reports.
Clinton also said that she was 'grateful that they've had a chance to contribute in each of our ways to making our country and our world stronger, safer, fairer and better'.
According to the report, Clinton, 65, leaves the post after four years, visits to 112 countries and nearly a million air miles.
She will be replaced by John Kerry, a Massachusetts senator, who was sworn in at a private ceremony on Friday.
The former first lady is now discussed as a possible candidate for the 2016 presidential election, the report said. (ANI)