Churches and state buildings here and in the UK will be lit up today as part of a campaign to highlight religious intolerance.
Derry, Waterford, Sligo and Armagh Cathedrals are taking part in the 'hashtag Red Wednesday' initiative as well as Knock Basilica.
In the UK, the houses of Parliament and The Palace of Westminster are among dozens of public buildings which will be brightly illuminated.
It's the brainchild of two organisations which advocate for Christians around the world.
John Newton from 'Aid the Church in Need' says it's a chance to show solidarity: