The head of the department responsible for the public order office, Dirk Schmaul, urged the revellers "not to urinate in building entrances and to behave a bit."
Mayor Reker said the beauty of Cologne's Carnival is that everyone parties together: "It doesn't matter what the origin story is or the family history."
The roots of Carnival go back to the far distant past, but in the winter of 1822-23, representatives of Cologne's upper class took measures to subdue what they saw as excessively crude and anarchic Carnival behaviour.