Iranian, arrested in Germany on suspicion of illegal exports to Iran was a valued agent of the German foreign intelligence service (BND)

Der Spiegel, here, and here, ...via War&piece

"...In a story to hit the streets in its Monday issue, the magazine said Sindbad's intelligence deliveries to Germany included photographs of tunnel-drilling machinery, details of secret warehouses and up-to-date reports on Iranian missile development work.His intelligence had been so good that the BND was even concerned he might be a double agent hoodwinking the West on Iran's orders..."