Police have arrested a man in Londonderry over alleged activity in Syria.
Eamon Bradley, 25, was arrested in the Creggan area of the city today.
He has been taken to Antrim police station for questioning.
Earlier this year his family expressed fears he had gone to Syria to fight in the country's on-going civil war, having originally told them he was going to Turkey on holiday.
It is believed Mr Bradley returned to Derry a few days ago.
It is understood detectives from the Police Service of Northern Ireland's Serious Crime Branch are working to establish if Mr Bradley was indeed in Syria over the last number of months and, if so, what he was doing there.
A PSNI spokeswoman said: "Detectives from Serious Crime Branch have arrested a 25-year-old man in Derry as part of inquiries into reports of alleged activity in Syria earlier this year.
"The suspect was arrested in the Creggan area of the city and has been taken to Antrim police station for questioning."