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 Nairobi—two days after he died in a hospital in India.

Security forces are on high alert following 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 on Saturday to pay their respects. Many wore orange—the party color of his Orange Democratic Movement—and waved branches, a traditional symbol of mourning among the Luo ethnic group to which Odinga belonged.

Odinga was the main opposition leader in Kenya for many years, losing five presidential campaigns. He is regarded as a founding father of Kenya's multi-party democracy and has a strong following in the western part of the country.

After a disputed election in 2007, he became prime minister in a coalition government. Tributes flowed in from many, including former US President Barack Obama, who remembered Odinga as a champion of democracy.

Odinga is expected to be laid to rest on Sunday following a private burial at his farm in Bondo, about 60 kilometers west of Kisumu. Family sources indicated that he wished for a quick burial within 72 hours of his passing.