The database used to be part of a replication but apparently something remained somewhere else.
The following commands helped:
use master
go
exec sp_helpreplicationdb
exec sp_removedbreplication 'Northwind'
ALTER DATABASE Northwind SET SINGLE_USER WITH ROLLBACK IMMEDIATE
ALTER DATABASE Northwind SET MULTI_USER
DROP DATABASE Northwind
"Cannot drop the database because it is being used for replication"
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