Mauritius has long sought sovereignty over the Chagos Archipelago, located  to the north-east. Chagos was administratively part of Mauritius from the 18th century when the French first settled the islands. All of the islands forming part of the French colonial territory of Isle de France (as Mauritius was then known) were ceded to the British in 1810 under the Act of Capitulation signed between the two powers. In 1965, three years before the independence of Mauritius, the United Kingdom split the Chagos Archipelago from Mauritius and the islands of Aldabra, Farquhar and Desroches from the Seychelles to form the British Indian Ocean Territory (BIOT). The islands were formally established as an overseas territory of the United Kingdom on 8 November 1965. On 23 June 1976, Aldabra, Farquhar and Desroches were returned to Seychelles as a result of its attaining independence. The BIOT now comprises the Chagos Archipelago only. The UK leased the main island of the archipelago, Diego Garcia, to the United States under a 50-year lease to establish a military base. In 2016, Britain unilaterally extended the lease to the US till 2036. Mauritius has repeatedly asserted that the separation of its territories is a violation of United Nations resolutions banning the dismemberment of colonial territories before independence and claims that the Chagos Archipelago, including Diego Garcia, forms an integral part of the territory of Mauritius under both Mauritian law and international law. After initially denying that the islands were inhabited, British officials forcibly expelled to the mainland approximately 2,000 Chagossians who had lived on those islands for a century. To force the inhabitants to leave, first the British authorities cut off food supplies, and those who resisted were threatened with being shot or bombed if they did not leave the island. To frighten them, their dogs and pets were gassed to death. At the United Nations and in statements to its Parliament, the UK stated that there was no "permanent population" in the Chagos Archipelago and described the population as "contract labourers" who were relocated. Since 1971, only the atoll of Diego Garcia is inhabited, home to some 3,000 UK and US military and civilian contracted personnel. Chagossians have since engaged in activism to return to the archipelago, claiming that their forced expulsion and dispossession were illegal.