The NSA has reportedly sought the help of Germany’s intelligence agency in spying on Munich-based Siemens over the company’s suspected business with Russian intelligence, Bild am Sonntag newspaper revealed. Siemens has denied any connection with Russia.

The revelation came from an unknown US intelligence source speaking to Germany’s Bild am Sonntag, and is the latest report in a spy scandal involving a widening gap in trust between the Americans and the Germans.