Anton Hofreiter, a Green Party lawmaker, told Germany's Funke Media Group on Sunday that disrupting the railway network's communications cables would require "very precise knowledge of the railway's radio system."Investigators said Saturday that communication cables, key for making sure trains are running smoothly, were cut at one location in Berlin and another in Herne in the western state of North-Rhine Westphalia.There are growing fears about assaults on Germany's critical infrastructure after Western nations said that leaks in Nord Stream 1 and 2 pipelines, which deliver Russian gas to Europe, were likely the result of sabotage.German armed forces Major General Carsten Breuer on Sunday said that "every substation, every power plant, every pipeline" was a possible target of attack.Breuer said Russia's invasion of Ukraine showed that war was possible on the European continent again and added that his team was preparing primarily for hybrid threats that combine both military and non-military activities."