About 250 people took part in a rally in Derry yesterday evening to protest against Wednesday night's bomb attack on the City of Culture offices.
Church leaders, politicians, and representatives from the arts sector were among the crowd who gathered in the city.
Meanwhile the PSNI have said they believe the Real IRA were behind Wednesday nights attack.
Police said the bomb could easily have killed. A senior police officer said the attack was "crazy".
The Real IRA are being blamed for the bomb which went off just before 11 o clock on Wednesday.
Republican sources said the terror group targeted the office because the City of Culture status underlined Derry's role within the UK.
They said the republican dissident organisation regarded the office as a highly symbolic target.
Police confirmed they were looking at the Real IRA as the organisation behind what is the second attack on the City of Culture office.