Journalist Lyra McKee was shot on Thursday night (Picture: PSNI/McKee family).
Two teenagers have been arrested by police in connection with the murder of journalist Lyra McKee in Northern Ireland.
The men, aged 18 and 19, were detained under anti-terrorism legislation and have been taken to a police station in Belfast for questioning, the Police Service of Northern Ireland (PSNI) said.
An outpouring of tributes to the 29-year-old was led by her partner, Sara Canning, who said Ms McKee's "amazing potential was snuffed out by this single barbaric act".
Watch: Police released CCTV footage following the murder of Lyra McKee.
Police believe the suspects were dissident republicans linked to the 'New IRA', as they clashed with police on the Creggan estate in Londonderry on Thursday night.
CCTV released by PSNI captured her final moments at around 10pm, when she stood among a crowd of other innocent bystanders and raised her phone in the air, apparently to photograph the violence.
Shaky mobile phone footage also released by detectives showed the suspected masked gunman lean from behind cover and appear to fire shots towards police and onlookers.
Police, who described the shooting as a "terrorist incident", believe the violence was orchestrated in response to an earlier search by officers aimed at averting imminent trouble associated with this week's anniversary of the Easter Rising.
Around 50 petrol bombs were thrown in the confrontation and two cars were burned out, police said.
Detective Superintendent Jason Murphy, who is leading the inquiry, described the murder as "senseless and appalling beyond belief".
"People saw the gunman and people saw those who goaded young people out onto the streets, people know who they are," he said.
"The answers to what happened last night lie within the community.
"I am asking people to do the right thing for Lyra McKee, for her family and for the city of Derry/Londonderry and help us stop this madness."
The 'New IRA' is an amalgam of armed groups opposed to the peace process and recently claimed responsibility for parcel bombs sent to London and Glasgow in March.
A vigil was held in Creggan in Ms McKee's memory, organised by local residents who said they felt sad and angry.
She had recently moved to Derry to live with "love of her life" Ms Canning and was also an editor for California-based news site Mediagazer, a trade publication covering the media industry.
In 2016, Forbes Magazine named her one of their 30 under 30 in media and she was working on a book due to be published in 2020.