The tribal nature of Ugandan politics was also manifesting itself in government. The UPC which had previously been a national party began to break along tribal lines when Ibingira challenged Obote in the UPC. The "North/South" ethnic divide that had been evident in economic and social spheres now entrenched itself in politics. Obote surrounded himself with mainly northern politicians – A. A. Neykon, Felix Onama, Alex Ojera – while Ibingira's supporters who were subsequently arrested and jailed with him, were mainly from the South – George Magezi, B. Kirya, Matthias Ngobi. In time, the two factions acquired ethnic labels – "Bantu" (the mainly Southern Ibingira faction) and "Nilotic" (the mainly Northern Obote faction). The perception that the government was at war with the Bantu was further enhanced when Obote arrested and imprisoned the mainly Bantu ministers who backed Ibingira.