Four men have been arrested after a bomb was found in Londonderry.
Police said the viable device was discovered after officers investigating dissident republican activity stopped a car in the Westway area of Creggan last night.
Two men aged 47 and 49 were arrested at the scene at about 8.40pm. Two others, also in their 40s, were arrested later.
A spokeswoman for the Police Service of Northern Ireland said:
All four have been taken to Antrim Serious Crime Suite and are assisting police with their inquiries.
A number of homes had to be evacuated as Army bomb disposal experts made the bomb, described as a viable improvised explosive device, safe.
The discovery comes ahead of a visit by US Secretary of State Hillary Clinton, who will speak at Stormont and visit the new Titanic Centre later today.
Hillary Clinton wanted to be President but she became America's top diplomat instead. Her job was to reset US relations around the world.
Hillary Clinton condemned a wave of street violence in Northern Ireland during a state visit to Belfast.