The international Co-Investigating Judge of the Extraordinary Chambers in the Courts of Cambodia (ECCC) is inviting scholars, academic organizations and any other organization operating in the field of international criminal law to submit written amicus curiae briefs on the issue on whether, under customary international law applicable between 1975 and 1979, an attack by a state or organization against members of its own armed forces may amount to an attack directed against a civilian population for the purpose of Article 5 of the ECCC Law (crimes against humanity).