An unexploded pipe bomb has been found in the grounds of Woodbourne police station in west Belfast.
The object was seen at the back of the station at about 1530 BST on Saturday.
Army bomb experts were tasked and the complex was evacuated while the object was examined. They said it was a "viable pipe bomb".
A month ago the remains of an exploded pipe bomb were found in the grounds of the station. Dissident republicans were suspected of being responsible.
West Belfast Area Commander Chief Inspector Emma Mooney said: "The people responsible have one clear aim - to kill or injure the police officers and staff working there.
"It is sheer luck that this has not been the result of these two attacks."
She said police have been taking steps to improve Woodbourne station through a series of enhancement works due to begin at the end of the month.
"The community has told us they want these improvements made however attacks like this put all that in jeopardy," she added.