LTTE agents successfully infiltrated Sri Lankan government and military organizations resulting in the assassinations of several high-ranking military personnel, including Major Tuan Mutalif and Colonel Tuan Meedin both of the Directorate of Military Intelligence, putting Sri Lankan intelligence services in a desperate condition. Under the Defence Secretary Gotabhaya Rajapaksa the intelligence agencies that were in desperate condition built-up a cohesive apparatus, which achieved significant success, including anti-LTTE operations overseas and the SIS played huge role in the Fourth Ealam war. The SIS was involved in the dismantling of the large number of long-term sleeper cells planted by the LTTE in cities helping Police track down criminals who were helping the LTTE for financial gain.