British army bomb squad officers have carried out a controlled explosion during a ongoing security operation in Co Derry.
Police said the explosion was on "a viable explosive device" found in Drumsurn this afternoon.
The security operation is continuing.
Óglaigh na hÉireann have claimed responsibility for the alert - now in its third day - as well as recent mortar and gun attacks in the area.
In a statement to the Derry Journal, the North Derry and Derry Brigade of the republican group said that an 'improvised explosive device' had been left in the Drumsurn area five weeks ago.
They said that the PSNI had ignored warnings about the device until recently.
They also claimed responsibility for a mortar attack and a gun attack in Currynierin and a mortar attack in Strabane.
Óglaigh na hÉireann also issued threats to “criminal elements within republican organisations” that they claim use the organisation’s name to extort money.
They warned that they would "deal with" these people and others who they accuse of turning property rented from republican families into "drugs dens."
“Having ordered individuals out of the city over recent months we remain the only organisation that does not encourage drug dealers by taking money in exchange for safety,” the statement read.
“Taxing drug dealers does not help our community. It turns a £100 drug dealer into a £10,000 dealer and this will not be tolerated.”
