Ammunition has been found in the Ballymagroarty area of Derry, the PSNI has said.
The discovery was made during what police described as "planned searches" in the area by officers from its "terrorism investigation unit".
The searches are part of an ongoing investigation into the New IRA.
Read more: MI5 raises terror threat level in Northern Ireland to 'severe'
In a separate search in the same area on Monday, a 38-year-old was arrested under terrorism legislation and later released.
A spokesperson for the PSNI said: "Detectives from the Police Service's Terrorism Investigation Unit (TIU) have recovered a quantity of ammunition during a planned search operation in Ballymagroarty in Derry.
"The search was part of an ongoing investigation by TIU into the activities of the New IRA. The ammunition seized will now be subject to further examination.
"In a separate search in Ballymagroarty yesterday, Monday 27th March by TIU detectives, as part of their investigation into New IRA activity, a 38-year-old man was arrested under Section 41 of the Terrorism Act 2000. He has since been released following questioning."
The police spokesperson added: "The investigation continues."
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