under direct rule of the British Government and was made a district province of the Punjab. In 1911, the capital of British India was transferred from Calcutta to Delhi. New Delhi, also known as Lutyens' Delhi, was officially declared as the capital of the Union of India after the country gained independence on 15 August 1947.
During the partition of India, thousands of Hindu and Sikh refugees, mainly from West Punjab fled to Delhi, while many Muslim residents of the city migrated to Pakistan. Migration to Delhi from the rest of India continues, contributing more to the rise of Delhi's population than the birth rate, which is declining.
The Constitution (Sixty-ninth Amendment) Act, 1991 declared the Union Territory of Delhi to be formally known as National Capital Territory of Delhi. The Act gave Delhi its own legislative assembly in Civil lines, though with limited powers. In December 2001, the Parliament of India building in New Delhi was attacked by armed militants resulting in the death of six security personnel. India suspected the hand of Pakistan-based militant groups in the attacks resulting in a major diplomatic crisis between the two countries. Delhi again witnessed terrorist attacks in October 2005 and September 2008 resulting in the deaths of 62 and 30 civilians respectively
