A device been discovered under the car of a serving part-time female PSNI officer near a property in Dungiven in Co Derry.
It is believed the officer’s car was parked close to a farm.
The Ballyquinn Road, remains closed at the junctions with the Camnish Road and the Curragh Road.
It is expected to remain closed for some time.
Motorists have been asked to continue to avoid the area and to seek alternative routes until further notice.
UPDATE AT 12.40 PM: Assistant Chief Constable CC Mark McEwan, Head of the PSNI’s Crime Operations Department, said: “I can confirm that the device is viable and investigations are ongoing to establish the full circumstances.
“We are treating this as an attack on a member of staff who also serves her community as a part time police officer.”
Local SDLP MLA Cara Hunter condemned those responsible for the attack on the home of the police officer.
“I fully condemn the attack on the private home of a serving police officer. No one should have to live in fear of going to work,” she said.
“Our officers in the PSNI risk their lives every day protecting every community; upholding the rule of law in Northern Ireland.
“This is an attack on the community, and actions of these people are not welcome in our society.
“My thoughts are with the officer and their family.”