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 in at a stadium in his political heartland following his state funeral, which was held on Friday in the capital, Nairobi - two days after he died at 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 colour of his Orange Democratic Movement - and waved branches, a traditional symbol of mourning and grief among the Luo ethnic group to which Odinga belonged. Odinga was the country's main opposition leader for many years, losing five presidential campaigns - the most recent three years ago. He repeatedly said he was cheated of victory, citing the manipulation of votes. Following a bloody and disputed 2007 election, he became prime minister in a unity government. He is regarded as one of the founding fathers of Kenya's multi-party democracy and has a devotional following in the west of the country. Among the dignitaries who have paid tribute to Odinga was former US President Barack Obama, whose Kenyan family is also from the area. Odinga is expected to be laid to rest on Sunday following a private burial at his farm in Bondo, about 60km west of Kisumu.