Special police officers secure a street near the house where a Syrian man lived before the explosion in Ansbach, southern Germany, on July 25. (Matthias Schrader/AP)

An upcoming report from the German government will recommend that all citizens stockpile five days of drinking water and 10 days of food supplies in case of "a development that could threaten our existence and cannot be categorically ruled out in the future," according to the Frankfurter Allgemeine Sonntagszeitung newspaper, which accessed the report.

The newspaper also quoted the report, "Concept for Civil Defense," as saying that Germany's "population will be obliged" to follow the recommendation, although it remained unclear whether it would be legally binding.

This would be the first time Germans would be subject to such a recommendation since the Cold War. A recent spate of terrorist attacks have left the country on edge. More than a million refugees arrived in Germany in 2015 alone, mostly fleeing Syria's civil war, and their presence has deepened a wide divide on immigration policy. Earlier in August, the German government announced a significant spending increase on police and security forces.

The report was compiled by Germany's Interior Ministry, whose spokesman told Reuters that it would be presented to the cabinet Wednesday.

The Interior Ministry is careful in the report to note that an attack on Germany's territory is unlikely to require a conventional deployment of ground troops. But the recommendation that Germans keep supplies on hand indicates that the government is thinking about what measures need to be taken should the government not be able to secure an area for a prolonged period of time after an attack.

Read More:

Germany’s potential burqa ban has a problem: Where are the burqas?

Angela Merkel says Germany’s terror problem predates the refugee crisis

It turns out many ISIS recruits don’t know much about Islam