After the Old Location Massacre on 10 December 1959, Nujoma was arrested and charged for organising the resistance and faced threats of deportation to the north of the country. By the directive of OPO leadership and in collaboration with Chief Hosea Kutako, it was decided that Nujoma join the other Namibians in exile who were lobbying the United Nations on behalf of the anti-colonial cause for Namibia. In 1960, Nujoma petitioned the UN through letters and eventually went into exile in February of that year. He left Namibia on 29 February, crossing into Bechuanaland and from there travelling to Bulawayo in Southern Rhodesia by train. He flew from Bulawayo to Salisbury and on to Ndola in Northern Rhodesia. With the assistance of a member of the Northern Rhodesian United National Independence Party (UNIP) he crossed into the Katanga Province of Belgian Congo. There Nujoma met Moise Tshombe from the Conakat Party of Congolese. Crossing back over the border to Ndola he boarded a flight to Mbeya. In Mbeya, he was treated for malaria and escaped from the hospital after being threatened with arrest by the colonial authorities. From Mbeya, Nujoma travelled with the assistance of officials of the Tanganyika African National Union (TANU) via Njombe, Iringa and Dodoma to Dar-Es-Salaam. With the assistance of Julius Nyerere, then president of TANU, he received a passport. While in Tanganyika, he received permission to address the UN Committee on South West Africa in New York. In April 1960, Nujoma travelled from Tanganyika to Khartoum, Sudan, and from there to Accra, Ghana, where he attended the All African People's Conference organised by Kwame Nkrumah against the French atom bomb test in the Sahara Desert. Nujoma met with other African nationalist leaders such as Patrice Lumumba, Gamal Abdel Nasser, Joseph Kasa-Vubu and Frantz Fanon at the conference. His early encounters with other African nationalist leaders left a lasting impression and informed his Pan-African outlook. Kwame Nkrumah assisted Nujoma to travel to United States and later to Liberia, where a case on South West Africa was being presented to the International Court of Justice.