Speaking at a press conference on Saturday morning, Detective Superintendent Jason Murphy, of the Police Service of Northern Ireland, described the incident as terrorism, and voiced his concerns about the nature of this crime.
The partner of a 29-year-old journalist who was shot dead during riots in Derry last night has said her legacy will "live on in the light that she has left behind".
"It was an outrageous act and I want on behalf of all of the people of Ireland to express our deepest sympathy to her partner Sara and her family and friends, and all of those who will have worked with her".
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. The footage also shows the gunman at the corner and an individual picking up something from the ground on the same corner.
Images on social media showed a auto and van ablaze and hooded individuals throwing petrol bombs and fireworks at police vehicles.
An off-duty journalist was killed after shots were fired during rioting in the Northern Irish city of Londonderry overnight, an attack that shocked the province and police said was likely the work of nationalist militants.
Leona O'Neill, a local journalist at the scene of the shooting, said that after McKee was hit and fell beside a police Land Rover, officers rushed her to Altnagelvin Hospital, where she died.
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John O'Doherty, director of the Rainbow Project, said she had a huge impact on many in Northern Ireland's LGBT community.
It claimed responsibility for a number of parcel bombs sent to London and Glasgow recently. "It is abundantly clear that they do not care who they harm", he continued.
"I say I hope when you reflect on what you have done, you will see the appalling, unsustainable, unjustified nature of what you have done".
Police at the scene of a shooting in Derry, Northern Ireland.
In the past, trouble has coincided with dissident republican commemoration of the battle for Irish independence every Easter.
There have been concerns that paramilitaries could be seeking to exploit the current political turbulence over Northern Ireland and its border with the Republic of Ireland, caused by Brexit.
Ireland's president has said those behind the killing of a journalist in Londonderry do not represent anybody on the island. The conflict officially ended with a peace accord, the Good Friday Agreement, in 1998.
Higgins speaks to media after signing the book of condolence at Belfast City Hall in remembrance of murdered journalist Lyra McKee. "We can not allow a Brexit which undermines the peace in N Ireland". "This tragedy is a reminder of how much everyone has to lose if we do".