renovated and the surface changed to meet the highest international safety requirements that were needed at large events with many spectators. The length then increased to . The city became host to several international and local events beginning with the inauguration on 26 November 1970. Carnation Revolution and independence As communist and anti-colonial ideologies spread out across Africa, many clandestine political movements were established in support of Mozambique's independence. These movements claimed that policies and development plans were primarily designed by the ruling authorities for the benefit of the ethnic Portuguese population, affecting a majority of the indigenous population who suffered both state-sponsored discrimination and enormous social pressure. Many felt they had received too little opportunity or resources to upgrade their skills and improve their economic and social situation to a degree comparable to that of the Europeans. Statistically, Portuguese Mozambique's whites were indeed wealthier and more skilled than the black indigenous majority, in spite of decreasing legal discrimination of Africans starting in the 1960s. The Front for the Liberation of Mozambique (FRELIMO), headquartered in Tanzania, initiated a guerrilla campaign against Portuguese rule in September 1964. This conflict, along with the two others already initiated in the other Portuguese overseas territories of Angola and Portuguese Guinea, became part of the Portuguese Colonial War (1961–74). Several African territories under European rule had achieved independence in recent decades. Oliveira Salazar attempted to resist this tide and maintain the integrity of the Portuguese empire. By 1970, the anti-guerrilla war in Africa was consuming an important part of the Portuguese budget and there was no sign of a final solution in sight. This year was marked by a large-scale military operation in northern Mozambique, the Gordian Knot Operation, which displaced the FRELIMO's bases and destroyed much of the guerrillas' military capacity. At a military level, a part of Portuguese Guinea was de facto independent since 1973, but the capital and the major towns were still under Portuguese control. In Angola and Mozambique, independence movements were only active in a few remote countryside areas from where the Portuguese Army had retreated. However, their impending presence and the fact that they wouldn't go away dominated public anxiety. Throughout the war period Portugal faced increasing dissent, arms embargoes and other punitive sanctions imposed by most of the international community. For the Portuguese society the war was becoming even more unpopular due to its length and financial costs,