Journalist Lyra McKee, 29, was shot in the head late on Thursday in Derry by, police believe, dissident republicans linked to the New IRA paramilitary group as they clashed with police in Northern Ireland's second city. I believe that the people responsible are members of the new IRA.
Former US President Bill Clinton said he was "heartbroken".
Authorities had released security camera video after the incident showing a masked person firing a gun in the direction of police vehicles in the midst of rioting in Derry's Creggan area Thursday.
Detective Superintendent Jason Murphy said the footage shows "the gunman at the corner and an individual picking up something from the ground on the same corner".
"This place will be a better place when the community says 'no, we want a good future for our children and we will remove from our midst anything that actually threatens our young people, corrupts them", he said.
The 1998 Good Friday peace deal largely brought an end to three decades of sectarian bloodshed in Northern Ireland between republican and unionist paramilitaries, as well as British armed forces, in a period known as "the Troubles".
A political class in the United Kingdom, which wouldn't know Derry from Derbyshire, is determined to lead the UK out of the European Union in such a reckless fashion that 40 years of painstaking diplomacy by the British and Irish governments, greatly assisted by Americans, could be flushed away the same way Northern Ireland was created, by fiat.
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She described the shame she felt at 14 as she kept the "secret" of being gay from her family and friends, and the love she eventually received when she was finally able to reveal it. She had been signed to write two books and was living with her partner Sara Canning at the time of her death.
The last tweet she sent out before she was killed showed a photo of the violent scene, with the caption "Derry tonight".
Ms Canning said her partner's dreams had been "snuffed out by a single barbaric act" and she had been left without "the woman I was planning to grow old with".
But there is relative peace, and young people like her could realistically aspire to a shared island, where the living counted more than the dead.
Please assist our investigation into the murder of Lyra McKee by uploading any footage you have to the Major Incident Public Portal via the following link: https://t.co/EL93YAAEMB ... Hamilton appealed for calm to prevail on Easter weekend. The group is also thought to be responsible for a January auto bombing in Londonderry that did not cause any injuries. There is a sense that what happened to Lyra marked a sea change and I want people to have the confidence to come forward and help us. Police had said earlier that one gunman had pulled the trigger during the rioting but was backed by an "organization", and said they were searching for multiple suspects.
An eyewitness told the BBC that a gunman fired indiscriminately into a crowd during riots on the crowded Creggan housing complex. McKee's killing also coincides with a recent uptick in violence in Northern Ireland.
Thousands of people gathered in the Fanad Drive area of Creggan, where the 29-year-old was killed while observing a riot.