Germany’s judicial system is groaning under the strain of an explosion in terror cases since Chancellor Angela Merkel opened the door to unlimited numbers of migrants in 2015.

The German Attorney-General opened a shocking 1,200 terror cases in 2017, of which around 1,000 were related to radical Islamic terrorism, Tagesschau reports.

This represents a fivefold increase on 2016, when the figure stood at around 250 — with roughly 200 cases being related to radical Islam.

Sven Rebehn, the head of the German association of judges, has warned that the system is struggling to cope with the sheer volume of its expanded caseload, with burden particularly heavy in the migrant hotspots of Berlin, Dusseldorf, Frankfurt, and Hamburg

The judicial federation has calculated that around 2,000 additional judges and prosecutors are needed if the country hopes to tackle the growing terror threat and clear the backlog, or else face real difficulty in the near future.

Merkel’s gift to Europe: anti-terror barriers – or #MerkelLego – ‘lovingly wrapped’ for Christmas. 🎄🎁⛄ https://t.co/oUuseAwKHz — Jack Montgomery ن (@JackBMontgomery) November 25, 2017

Migrants have not only increased the workload of the courts in the field of terrorism — for example, 91 per cent of a 48 per cent surge in Bavarian rape cases was attributed to migrants in September 2017.

But the costs of expanding the judicial system’s capacity to absorb the surge in terror cases is not the only expense to fall on Germany as a consequence of mass migration.

The cost of the country’s more recent arrivals was predicted to reach close to 100 billion euros by 2020 last year — with the figure likely to have increased since then.

Germany also faces more longstanding issues with immigration: between 43 and 48 per cent of the country’s substantial ethnic Turkish population — which has been growing steadily since the introduction of a special ‘guest worker’ programme in the 1960s and now numbers in the millions — is ‘economically inactive’, with German media reporting the “vast majority … declare that — at least for the moment — they are not interested in a job.”

Follow Jack Montgomery on Twitter: @JackBMontgomery