There may be a bomb disposal in the first week of the semester on Monday and Tuesday (08. and 09.04.). It is not yet clear whether this will be necessary. A bomb is suspected in the course of construction work.
If a bomb is actually found and an evacuation is necessary, virtually the entire Poppelsdorf campus will be affected. In this case, nobody is allowed to stay in the area. This will presumably be decided on Monday morning.
As a precautionary measure, the university will therefore only hold online teaching on these days.
(Correction: Only related to courses taking place in the affected areas!)
At the moment, it is only an assumption. It will only be determined on Monday morning whether there is actually a bomb at the suspected location. You should therefore currently only prepare for an evacuation (i.e. act in such a way that you can leave quickly) and find out on April 8th whether an evacuation will actually take place!
The university provides further information (currently in german only) here: https://www.uni-bonn.de/de/universitaet/aktuelle-themen/bombenfund (official information is of course only available from the City of Bonn)