Mullaitivu police detained an individual involved in Mullivaikkaal remembrance activities and summoned one other organiser for questioning on Tuesday evening.
The organiser, Father Elil Rajan, responded to the summons by attending the police station with a lawyer.
Father Elil was questioned about the remembrance activities he was involved in organising and was released after submitting a statement.
The other individual was also released after the statement was given.
Last week, multiple military officials were reported to have harassed the same civil society members involved in the remembrance initiative of carving the names of the dead on stones.
Organisers have expressed concern that systematic intimidation of those involved in remembrance activities is being carried out in order to deter Tamils attending memorial events in large numbers.