Germany faces a concrete terrorist threat that could result in acts of violence "at any given time," mass circulation newspaper Bild reported Thursday citing a confidential report from the Interior Ministry.
"Germany is a declared and actual target for jihad-motivated violence" that can "turn into concrete acts of violence against state and civil institutions, civil servants and civilians at any given time," the leaked report said, according to Bild.
Germany could face a series of terrorist attacks similar to those committed in Paris, the report says - spread across several days and supported by the use of firearms, fire bombs and other explosives.
The revelations have yet to be independently verified by dpa.
Though Bild does not provide the date that the report was circulated, it says it was before the terrorist attack that killed 10 Germans in central Istanbul on Tuesday and has been blamed on the Islamic State extremist group.
Germany's Justice Minister Heiko Maas said on Wednesday that the threat of terror attacks on German soil had not increased in the wake of the Istanbul incident, adding that there was not currently "any concrete evidence of targets."
Of the estimated 850 people that have left Germany to pledge allegiance to the Islamic State's caliphate or to wage jihad alongside extremist groups, just over a third have returned, according to German security officials.