The violence in Delhi was triggered by the assassination of Indira Gandhi, India's prime minister, on 31 October 1984, by two of her Sikh bodyguards in response to her actions authorising the military operation. After the assassination following Operation Blue Star, many Indian National Congress workers including Jagdish Tytler, Sajjan Kumar and Kamal Nath were accused of inciting and participating in riots targeting the Sikh population of the capital. The Indian government reported 2,700 deaths in the ensuing chaos. In the aftermath of the riots, the Indian government reported 20,000 had fled the city, however the People's Union for Civil Liberties reported "at least" 1,000 displaced persons. The most affected regions were the Sikh neighbourhoods in Delhi. The Central Bureau of Investigation, the main Indian investigating agency, is of the opinion that the acts of violence were organized with the support from the then Delhi police officials and the central government headed by Indira Gandhi's son, Rajiv Gandhi. Rajiv Gandhi was sworn in as Prime Minister after his mother's death and, when asked about the riots, said "when a big tree falls (Mrs. Gandhi's death), the earth shakes (occurrence of riots)" thus trying to justify communal strife.