A 31-year-old man was arrested and later released during a search of the Derry headquarters of dissident republican political group, Saoradh.
Police searched Junior McDaid House at Chamberlain Street on the edge of the city’s Bogside as well as the homes of three members of the group during yesterday's operation.
A PSNI spokesman said detectives from the Terrorism Investigation Unit were investigating the illegal use of a lottery.
The spokesman said: “This morning we searched five properties in the city in connection with an ongoing investigation into the illegal use of a lottery in the Derry/Londonderry area and seized a sum of money and other items in connection with lottery activity.
“A 31-year-old man was arrested this morning and has subsequently been released on bail pending further questioning. The investigation is continuing.”
Saoradh subsequently revealed some of the searches were at the homes of its members.
