Tens of thousands of mourners have gathered in the Kenyan city of Kisumu to pay their respects to the late Prime Minister Raila Odinga.

The 80-year-old's body is now lying in state at a stadium in his political heartland following his state funeral, which was held on Friday in the capital, Nairobi. He died at a hospital in India.

Security forces are on high alert after the deaths of at least five people at events held in recent days to mourn Odinga.

I have come here to mourn an icon of Africa, one mourner, Dixon Ochieng, told the BBC, while others could be heard to cry out we are orphans in their grief.

People of all ages began arriving at the Jomo Kenyatta Stadium in Kisumu before dawn to pay their respects, many wearing orange - the party color of his Orange Democratic Movement - and waving branches, a traditional symbol of mourning in the Luo community.

Odinga was the country's main opposition leader for many years, having lost five presidential campaigns. He was known for fighting against electoral rigging and manipulation.

Among the dignitaries paying tribute was former US President Barack Obama, who called Odinga a champion of democracy and praised his commitment to the interests of Kenya over his personal ambitions. Odinga is expected to be laid to rest on Sunday at a private burial in his farm in Bondo.