Three men and a fifteen-year-old boy have been arrested in connection with the death of Lyra McKee.
The four males, aged 15, 18, 38 and 51, were arrested in Derry under terrorism legislation, following a series of searches in the area.
They were taken to the serious crime suite in Musgrave Station, Belfast where they are currently being questioned by detectives.
Promising journalist, Lyra McKee was shot in Derry over the Easter weekend when a dissident republican group fired indiscriminately at police lines during a disturbance.
On Thursday morning, the Police Service of Northern Ireland said four people have been arrested as part of their murder investigation.
Detective Superintendent Jason Murphy said the arrests came after searches at four houses.
Saoradh offices in Derry searched by PSNI detectives investigating Lyra McKee murder
"As part of this morning's operation detectives carried out searches at four houses in the city and arrested four people in connection with the violence which was orchestrated on the streets of Creggan on the evening of Lyra McKee's murder," he said.
"They are currently in custody where they are being questioned.
"I want to thank the public for the widespread support we have received to date, including more than 140 people who have provided images, footage and other details via our dedicated major incident public portal.
PSNI confirm anonymity to witnesses with information on journalist Lyra McKee's tragic murder
"I still want to hear from anyone who can tell us anything they know.
"I would urge anyone who has any information to contact my team of detectives on 101.
"Alternatively, if you would prefer to provide information without giving your details, you can contact the independent charity Crimestoppers and speak to them anonymously on 0800 555 111."
People can also upload any footage that they have to the major incident public portal HERE.
