The family of a schoolboy who has been missing for 30 years has criticised people who have made inaccurate comments about his disappearance.

13 year old Philip Cairns went missing from his home in Dublin 30 years ago

His sister Sandra Cairns was speaking at an event to mark Missing Persons Day.

She says a recent high profile social media campaign has been hugely damaging:

Kim Buckley reports from the event at Farmleigh House:

Homing pigeons released by loved ones of those who've gone missing #nationalmissingpersonsday pic.twitter.com/ctn5cXCLpy

— Kim Buckley (@KiiimBuckley) December 7, 2016