In Nov. 1969, a group of 89 Native Americans occupied Alcatraz Island for 15 months, to gauge the US's commitment to the Treaty of Fort Laramie (1868), which stated that all abandoned federal land must be returned to native people. Eventually the government cut off all electrical power and all telephone service to the island. In June, a fire of disputed origin destroyed numerous buildings on the island.[7] Left without power, fresh water, and in the face of diminishing public support and sympathy, the number of occupiers began to dwindle. On June 11, 1971, a large force of government officers removed the remaining 15 people from the island.1