"Sabotage to cables that were vital for train traffic meant Deutsche Bahn had to stop trains running in the north this morning for nearly three hours," Deutsche Bahn said.Investigators, however, said the communications cables were cut at one location outside Berlin and another in the western state of North Rhine-Westphalia.German Interior Minister Nancy Faeser said authorities "have to assume intentional acts" were behind the rail disruption as cables were severed at two locations.Cables for DB's communication network had been severed in two locations, unnamed security sources told Der Spiegel magazine.Travel to and from Hamburg, Schleswig-Holstein and Lower Saxony in the direction of Kassel- Wilhelmshöhe, Berlin and North Rhine Westphalia had been suspended."