Two young men have been arrested over the murder of journalist Lyra McKee in Londonderry.
The 29-year-old victim died in hospital after being shot during rioting in the Creggan area of Derry on Thursday night.
Detectives have now arrested two suspects, aged 18 and 19, under the Terrorism Act.
They have been taken to Musgrave Serious Crime Suite.
Police have already released footage of events that unfolded in the Creggan.
In the grainy footage, Ms McKee can be seen among the crowd, filming the disorder on her phone.
A hooded gunman is shown peering round a building before taking aim and firing, while another person later picks up something from the ground - possibly shell casings from the firearm.
Vigils are being held across Northern Ireland and the Republic, with thousands of people having remembered Ms McKee at gatherings in Belfast, Derry and Dublin.
More vigils are planned for over the Easter weekend.