After the independence of India in 1947, the area remained a part of the province of Assam. Nationalist activities arose amongst a section of the Nagas. Phizo-led Naga National Council demanded a political union of their ancestral and native groups. The movement led to a series of violent incidents, that damaged government and civil infrastructure, attacked government officials and civilians. The union government sent the Indian Army in 1955, to restore order. In 1957, an agreement was reached between Naga leaders and the Indian government, creating a single separate region of the Naga Hills. The Tuensang frontier was united with this single political region, Naga Hills Tuensang Area (NHTA), and it became a Union territory directly administered by the Central government with a large degree of autonomy. This was not satisfactory to the tribes, however, and agitation with violence increased across the state – including attacks on army and government institutions, banks, as well as non-payment of taxes. In July 1960, following discussion between Prime Minister Nehru and the leaders of the Naga People Convention (NPC), a 16-point agreement was arrived at whereby the Government of India recognised the formation of Nagaland as a full-fledged state within the Union of India.