Parthipan joined the
militant Liberation Tigers of Tamil Eelam (LTTE) prior to the 1983
Black July anti-Tamil riots. As hostilities increased in northern Sri Lanka, the LTTE handed over a letter to the Indian High Commissioner on 13 September 1987 making five demands: the release of all political prisoners held under the
Prevention of Terrorism Act and emergency regulations; cessation of
Sinhalese colonisation of Tamil areas under the guise of "rehabilitation"; cessation of all "rehabilitation" activities until the establishment of the Interim Administrative Council; cessation of construction of police stations in the
Northern and
Eastern provinces; and the disarmament of
Home Guards and withdrawal of the army/police from schools and colleges. The demands were aimed at the Indian rather than the Sri Lankan government because the LTTE believed that Indians could force the Sri Lankans to comply. The LTTE gave the Indians 24 hours to respond but no response, or even an acknowledgement, was received. ==Hunger strike==