"Therefore we have now launched a murder inquiry here in the city". Matthew Hughes said he had been left "devastated" by the death of one of his closest friends.
Mr Hamilton said: "I stood here in January and we talked about the bomb and the act of violence against this city, and yet again we see another act of violence in this city which has had horrendous consequences and which will affect people for many, many years".
Mayor of Derry City and Strabane District Council, Councillor John Boyle, has spoken of his shock and sadness at what he described as the "senseless and ruthless" murder of 29-year-old journalist Lyra McKee last night.
The acclaimed journalist from Belfast was just 29-years-old and had recently signed a two-book deal with publisher Faber & Faber. "Sick to my stomach tonight".
According to Sky News in the United Kingdom, tension has been building in the Creggan area leading up to Easter, when republicans mark the anniversary of the 1916 uprising against British rule in Ireland.
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This year the group claimed responsibility for a auto bomb outside the courthouse in Bishop Street, Derry.
McKee, a journalist whose work has been published in magazines and newspapers both in Northern Ireland and overseas, was writing a book on the disappearance of young people during the three decades of sectarian violence in Northern Ireland, which ended with the 1998 Good Friday Agreement peace deal.
She added: "Those who brought guns onto our streets in the 70s, 80s and 90s were wrong". It is equally wrong in 2019.
Londonderry was once a flashpoint in fighting between Irish nationalists, who want to unite Ireland, and Unionists, who want to keep Northern Ireland within the UK.
The New IRA is am amalgam of a series of armed groups opposed to the peace process. No-one was hurt. A group calling itself the "IRA" later said it had planted the device.
No one has ever been charged with the 2001 murder of the last journalist to be killed in Northern Ireland, the Sunday World's reporter Martin O'Hagan, who was deliberately targeted and killed by the Loyalist Volunteer Force.
Derry was the scene of one of the darkest episodes in the Troubles in 1972, known as Bloody Sunday, when British troops opened fire on a civil rights demonstration and killed 13 people.