Five men have been arrested as part of the investigation into the murder of Lyra McKee.
The journalist was shot dead as she observed rioting in the Creggan area of the city in April 2019.
The men - aged 20, 21, 41 and 54 - were arrested in Derry on Friday morning under terrorism laws, the PSNI says.
They have been taken to Belfast for questioning.
Three men have been previously charged in connection to the 29-year-old's murder - while another five were charged with rioting offences.