Thousands line streets to say final farewell to Muhammad Ali

World leaders and celebrities will be among 18,000 people expected to attend the funeral at the KFC Yum! Centre, with the ceremony broadcast to millions of viewers around the world.

The coffin of Muhammad Ali has begun its journey across the boxing great's home city of Louisville, Kentucky as fans and loved ones say a final farewell to "the greatest".

Thousands of people have lined the streets for the procession which is making its way past the Muhammad Ali Centre before continuing across the city to Cave Hill Cemetery for a private burial.