The men were arrested under the Terrorism Act. The 29-year-old journalist was shot dead last year.
Demonstrators will urge an end to killings as they make the journey from Belfast to Londonderry.
Meanwhile IRA graffiti has been painted over in Derry, where she was killed.
The journalist was shot on the Creggan estate on April 18.
Historical events linger across generations with sometimes lethal consequences but dispassionate revisionism with new insights, facts and reflections - good history in short - can scotch potent myths and consign running sores to the past, as has been the case with troubled Anglo-Irish relations, and could be for Kurdistan.
So my year as 'Musician In Residence' in Derry-Londonderry, the UK City of Culture has come to an end. I have mixed feelings.
But Jamie Cullum's BBC Radio show called and it made perfect sense to take the opportunity to big up this crazy city on air. Actually, this broadcast is not for his weekly Radio 2 show, but for a documentary he is doing for BBC Radio 4 called 'Piano Pilgrimage'. The premise of the show is to explore the changing fortunes of the 'home piano'.
We implore anyone with an interest in the visual arts to make a journey to the very edgiest edge of Europe this year. There will never be a better time to visit Derry and you will not be disappointed.
Between 2011 and the start of this year, I've worked with a close and talented team in Derry~Londonderry to build a programme of over 200 events. The schedule is both world class and home grown, that's what makes it so unique and makes the city worth a visit.
A former HMV worker has upended the music giant's attempts to pull the plug on his new record shop. Lawyers for the troubled
Music City, a dawn-to-dawn festival celebration of music and performance that took place this past summer solstice weekend in Derry-Londonderry, UK's City of Culture. A day when people seemed to just miss work w
Are Barack Obama and other world leaders in danger? In short, no. Attacking police patrols in rural Fermanagh in an attempt to create 'liberated zones' is in a totally different league to attempting to kill world leaders. A direct attack on the summit is unlikely for two reasons.
The Saturdays lit up the stage as Radio 1's Big Weekend in Northern Ireland got into gear. Flamboyant dance routines and
For any self-respecting Irish person in London - or for any Londoner of Irish decent - this new series could be portrayed as being representative of them, and they may not like what they're about to see.
In recent times, Derry's international reputation has been defined by the sectarian conflict known as 'The Troubles'. It was here in this city that civil rights marches escalated into the street battles of the Bogside and the Bloody Sunday shootings.
The Causeway truly justifies its world heritage status. To stand on the eerily hexagonal stones and look out into the stormy Atlantic Ocean is a rare thrill.
Police have apologised after raiding the home of a Sinn Fein lord mayor in Northern Ireland as part of a probe into republican
Two explosions in Londonderry forced elderly residents to leave their sheltered accommodation. Homes and businesses in the
Good morning Lemmings and rejoice for a new record has been set! That's right, I managed to fully comprehend around 68.2% of last night's show which is by far and away the most clarity I have ever achieved with an episode from Northern Ireland (I usually manage 20 or so percent).