Police are investigating a suspicious object in the car park on Bishop Street where a large car bomb was left earlier this week.
A PSNI spokesperson tthey are investigating the device, which was discovered shortly after 11am.
The car park has been sealed off and occupants of nearby buildings have been evacuated.
All hearings in Bishop Street court house have been suspended while the object is examined.
The discovery of the suspicious object comes just days after a 50 kg bomb was left in a car in the same car park on Sunday evening. Dozens of local people, including elderly residents of Alexand e r House, were evacu a ted from their homes while bomb disposal experts carried out a controlled explosion on the device. Dissident republican group Óglaigh na h’Éireann claimed responsibility for the attempted bomb attack at the weekend