"Accountability for crimes against humanity must not be further delayed" the Timor-Leste National Alliance for an International Tribunal (ANTI) told the UN Security Council in a letter delivered this week.
The letter was endorsed by more than 30 other organizations from outside of Timor-Leste.
"We are still not yet free of the shadow of serious crimes committed during the 24 years of Indonesian occupation. We have suffered a lot during that period; physically and psychologically, because of torture from various types of violations, including sexual violence against women, and the loss of 180,000 human lives because of the brutal, illegal Indonesian military occupation," said ANTI.
ANTI added "If impunity continues to prevail in Timor-Leste, it will have a negative impact on the stability and security of our country; undercutting the efforts of the United Nations to establish rule of law and strength security institutions. In addition, the perpetrators are continuing to commit similar crimes in Indonesia."
The Security Council should "discuss the recommendations of the  Commission of Experts regarding the establishment of an International Criminal Tribunal when national mechanisms fail." They also urged the Council to enlarge the mandate of the Serious Crimes Investigation Team (SCIT) to allow the investigation and support the prosecution "of the principal perpetrators of serious crimes and crimes against humanity throughout the Indonesian occupation from 1975-1999." The SCIT current mandate only allows investigations of murders committed during 1999, when the UN sponsored the referendum which led to Timor-Leste's independence.
ANTI argues that such prosecutions are "the only solution to end impunity in Timor-Leste and Indonesia, so that democracy and human rights that we yearn for can be achieved in Timor-Leste and other countries."