Tens of thousands of people started arriving in the central South African city of Bloemfontein on Sunday as celebrations kicked off to mark the centenary of the African National Congress (ANC), Africa's oldest liberation movement, dpa reported from Johannesburg. South African President and ANC leader Jacob Zuma was to address the rally, which will be attended by 46 heads of state to mark the foundation of the party that was founded in 1912 and channeled the opposition of blacks to white minority rule. Roads in Bloemfontein were dotted with the yellow, green and black flags of the ANC, which came to power in April 1994 under the leadership of Nelson Mandela in the first democratic election after the fall of Apartheid the same year. Huge posters of Mandela were erected at the Bloemfontein stadium, where thousands of people danced, sang and waved ANC flags in celebration.