The local campaign was launched by the Mannar Citizen’s Committee along with the Disappeared Parents Association.
Head of the organisation Father Emmanuel Sepamalai, Northern Province transport minister P Deneeswaran and TNPF leader Gajendrakumar Ponnambalam, took part, alongside religious leaders, civil society representatives and dozens of passersby.
However the Sri Lankan authorities have disrupted the campaign on several occasions in both Jaffna and Trincomalee.
Signatures are being collecting signatures ahead of the United Nation Human Rights Council session later this month, where a report into mass atrocities in Sri Lanka is to be discussed.