Today marks 50 years since the Bloody Sunday atrocity in Derry City.
13 people died after British soldiers shot at protestors taking part in a civil rights and anti-internment march. A 14th person died from their injuries four months later.
The Taoiseach will lay a wreath at the Bloody Sunday monument in the Bogside, while President Michael D Higgins will deliver a commemorative online address this afternoon.
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In 2010, the then British Prime Minister David Cameron apologised on behalf of his government and acknowledged paratroopers had fired the first shot.
Tony Doherty's father, Patrick, was killed on Bloody Sunday at the age of 32.
He says victims' families have worked tirelessly to get justice for their loved ones.
