Four men have been arrested by police investigating the murder of a journalist in Londonderry.
Four men, aged 20, 27, 29 and 52, were arrested in Derry under the Terrorism Act on Tuesday morning.
They are being questioned by detectives at Musgrave Serious Crime Suite in Belfast.
Detective Superintendent Jason Murphy has renewed his call to the public for help in bringing Lyra McKee’s killers to justice, saying: “I have always believed that some people within the community know what happened and who was involved.
“I understand that people may be frightened to talk to us. I have previously given my personal assurance relating to anonymity for the purpose of this investigation and I renew this assurance today.”
Mr Murphy added: “I want the community in Creggan to think about how that horrific attack impacted them personally and how it impacted the entire community and local policing to convert that revulsion into tangible evidence to bring those who murdered Lyra to justice.
“I also know that many people were recording mobile phone clips that night and whilst we had a huge response to my initial appeal for those videos, I believe that others may exist. I would ask anyone who has mobile phone footage to upload it onto our Major Incident Public Portal”.
The New IRA had previously apologised for the murder, saying Ms McKee was caught in the line of fire while standing with what the organisation called “the enemy”.
Her death sparked widespread revulsion and a renewed effort to restore a power-sharing agreement in Stormont following years of political instability in the country.
At her funeral in April last year, the priest confronted politicians, saying: “Today we grieve but tomorrow let us fill that hole by adopting Lyra’s spirit, example and vision.
“Let us put false starts behind us and once and for all build an alternative Ulster that we, and especially our children, can be proud of.
“Let us make the lasting legacy of Lyra McKee that peace.”