The police can seldom have been been hounded by speculation about an active investigation in the way in which they have been throughout this one.
In fact I can't think of one.
Particularly one which has in its time been subject to three forces participating with only the initial investigators widely peer acknowledged to have botched the case right from the word go is the only one to have escaped public opprobrium.
Scotland Yard have been widely criticised as have the Bundeskriminalamt both of whom have a mandate, expertise and resources in international cases such as MM's
My opinion
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The Bundeskriminalamt has also been assigned the task of promoting police co-operation in Europe and throughout the world as a legal mandate. After all, national borders should not be an obstacle in the fight against crime.
All official communications between the German police and other countries are routed through the Bundeskriminalamt. This makes it possible to compile important information and ensure uniform application of legal provisions. The BKA acts as the national central office for Interpol, Europol and the Schengen Information System.
The BKA investigates outstanding cases of international crime as defined by law either on its own initiative, or whenever a public prosecutor's office puts it in charge of such investigations due to the significance of the criminal offence in question.
The BKA is also responsible for protecting the members of the constitutional organs of the Federation.
www.bka.de