|Formed||17 February 1966|
|Headquarters||New Phoenix Park, 30 Irrawaddy Road, Singapore|
|Parent agency||Ministry of Home Affairs|
The Internal Security Department (ISD) is a domestic counter-intelligence and security agency of Singapore under the purview of the Ministry of Home Affairs (MHA), tasked to confront and address security threats, including international terrorism, foreign subversion and espionage. It has the utmost right to detain without trial individuals suspected to be a threat to national security.
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.
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.
It was formerly part of the Ministry of Interior and Defence (MID) until it was split on 11 August 1970. In 2004, it was placed under the National Security Coordination Secretariat to improve intelligence sharing with other national intelligence agencies.
The powers of investigation and arrest of the ISD are regulated by several laws, including:
See also: Timeline of Singaporean history
These events are related to ISD and internal security of Singapore.
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.
|Yoong Siew Wah||?–1974|||
|Wang Hsu Chih||1974–?||(acting)|||
|Lim Chye Heng||1975–1982|||
|Tjong Yik Min||1986–1993|||
|Chiang Chie Foo||1993–1997|||
|Benny Lim Siang Hoe||1997–2003|||
|Pang Kin Keong||?–2010|||
|Loh Ngai Seng||2010–2016|||
|Tai Wei Shyong||2016–?|
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