The ISD also monitors and addresses potential threats from communism, prevention of racial tension which might affect the public peace, domestic counter-terrorism, international counter-terrorism, fraud against the state, surveillance, apprehension of suspected militants or terrorists and protection of Singapore's national borders.
History
ISD was first established as part of the Special Branch in 1948 by the British colonial government.
In 1963, it became part of the Malaysian Special Branch when Singapore merged with Malaysia, and after Singapore gained independence, the Internal Security Department was formally established on 17 February 1966.
1997, 1998, six arrested for involvement in espionage and foreign subversive activities.
2001, 9 December, members of Jemaah Islamiyah (JI) arrested for bomb plots on the American, Australian, British and Israeli embassies.
2008, 27 February, Mas Selamat bin Kastari, alleged leader of JI's Singapore branch, escaped while under the ISD's custody.
2009, 1 April, the Malaysian authorities captured Mas Selamat in Skudai, Johor.[4]
2010, 8 February, the ISD summoned Pastor Rony Tan of Lighthouse Evangelism over video clips posted on the church website that were deemed 'highly inappropriate and unacceptable' as they "trivialised and insulted the beliefs of Buddhists and Taoists".[5]
2021, 27 January, the ISD reported it had arrested a 16-year old Protestant youth under the Internal Security Act in November 2020 for plotting to attack two Singaporean mosques on the anniversary of the 2019 Christchurch mosque shootings. The youth had written a manifesto praising the perpetrator Brenton Tarrant as a "saint" and describing the Christchurch mosque shootings as the "justifiable killing of Muslims." The teenage is the youngest person and the first far right extremist to be detained under the ISA.[6][7]
2021, 29 January, Yeo Jun Wei, was detained by the ISD for investigations into engaging in "activities prejudicial to Singapore’s security".
The following is a list of former Director of the Internal Security Department. The identity of the director is not conspicuously made known to the public, until they relinquish the post.
Mathew Jones, "Creating Malaysia: Singapore Security, the Borneo Territories and the Contours of British Policy, 1961–1963" in Journal of Imperial and Commonwealth History, Vol. 28, No. 2, May 2000. pp. 85–109