Amnesty International is paying its respects to journalists who've died in the line of fire on World Press Freedom Day.

Over 100 journalists have been killed in the past year - dozens in Syria alone.

Representatives of the National Union of Journalists will lay a wreath at the Veronica Guerin memorial this afternoon to mark the occasion. The ceremony will take place at 3.30pm in the Coach House Garden, at Dublin Castle. 

Noeleen Hartigan of Amnesty International Ireland says it's a tribute to the journalists who've given their lives in pursuit of the truth.