A device has been found outside the home of a serving police officer in Derry today.
It was discovered under a car at Ardanlee, in the Culmore area of the city, this morning.
A number of homes have been evacuated in the ongoing security alert.
The area has been cordoned off and British Army bomb experts are examining the object.
Homes have also been evacuated in Co Tyrone after the discovery of a suspicious object at Sion Mills.
Police in Strabane are not linking the two incidents.