Detectives investigating the murder of journalist Lyra McKee have arrested a man, 27, in Londonderry.
The man was held on Wednesday morning under section 41 of the Terrorism Act 2000.
He was taken to Musgrave police station in Belfast, and officers have also searched a house in Londonderry.
Ms McKee, 29, was shot in the head while reporting on disturbances in the Creggan area of Londonderry in April last year.
She was standing near a police vehicle when she was hit by a bullet fired towards officers, and later died in hospital.
The so-called New IRA said it was involved in her death and that the journalist had been caught in the line of fire.
In February, a 52-year-old man was charged with her murder. He denies the charge.
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