Speaking to media in Londonderry on Saturday afternoon, Detective Superintendent Jason Murphy said they arrested this morning two teenagers, aged 18 and 19, under the Terrorism Act and conducted a number of searches as part of the ongoing investigation into Lyra's murder.
McKee, 29, was fatally shot during street riots on Thursday night in the Creggan area of Londonderry which is close to the border with the Republic.
Catholic priest Father Joseph Gormley, who read the last rites for McKee, told BBC radio: "This rioting was clearly orchestrated".
The agreement ended decades of sectarian conflict between the republican Catholics, who want a united Ireland, and the unionist Protestants who wish to remain in the U.K.
CCTV footage released by the police on Friday shows McKee standing in a crowd of civilians next to police vehicles.
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Moon has expressed an eagerness to engage with the North on such projects, but Washington wants it to stick to sanctions. Kim is to visit Russia for a summit with Russian President Vladimir Putin later this month.
Around 50 petrol bombs were thrown in the confrontation and two cars were burned out. Police said the New IRA dissident group was most likely responsible and called it a "terrorist act". "I know there will be some people who know what happened but are scared to come forward", he said.
The European Union's chief Brexit negotiator, Michel Barnier, has said the murder is a reminder of how fragile peace is in the region.
Thursday's unrest raised memories of past decades of violence in Northern Ireland.
Floral tributes have been piling up at the lamppost where Miss McKee fell, including one written to "beautiful Lyra" from her partner Sara Canning. She recently signed a book deal.
Sinn Fein leader Mary Lou McDonald, holding a rainbow LGBT flag, said: "I carry this flag for Lyra, an activist, a journalist, a child of the peace process, and a woman who should not have lost her life at the age of 29". She is perhaps most remembered for her blog post, "Letter to My 14-Year-Old Self", which chronicled her struggle growing up gay in Northern Ireland and the later acceptance she received from her family.
"This can not stand. Lyra's death must not be in vain because her life was a shining light in everyone else's life and her legacy will live on and the life that she has left behind", Canning said, CNN reported.
They suspect the two men are linked to a group that split from the Irish Republican Army, or IRA.
And so she did with the libel laws - continuing to cajole politicians and our group to get the law reformed to protect investigative journalists like her.
"We will continue to work positively and sensitively with the local community to achieve this".
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As the report makes clear, the United States constitution grants a president wide latitude to act under his executive authority. Additionally, former campaign adviser Rick Gates recalled Trump being frustrated that the missing emails had not "been found".