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Heydari said that from 2002 to 2007, when he headed the Iranian Foreign Ministry's office for airports, he saw many technicians from North Korea travel to Iran.

"I witnessed repeated roundtrips of North Korean specialists and technicians — given that I was right there at the border — who came to collaborate on the Iranian nuclear program," he said through a translator.

Heydari said their visits were handled "in a very discreet way, so they could come through unnoticed."

Heydari said he also had contacts then with officials from Iran's Revolutionary Guards, and "it was clearly said that Iran was concentrating on two objectives ... the first was to build the range of surface-to-surface missiles, the second was to get a nuclear weapon with North Korea's help."