The AQ Khan network helped Iranian nuclear programme by helping the Islamic Republic build capabilities that could possibly be used for nuclear weapons. 

When Pakistani AQ Khan network helped Iran's atomic programme and possibly helped its quest for a nuclear weapon

In the 1970s, Khan worked at URENCO, a European nuclear consortium based in the Netherlands. There, he accessed classified designs for Zippe-type gas centrifuges, essential for enriching uranium.

This Pakistani physicist ran a dangerous nuclear black market, but how did he supply stolen blueprints to Iran?

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When Pakistani AQ Khan network helped Iran's atomic programme and possibly helped its quest for a nuclear weapon

This Pakistani physicist supplied stolen nuclear blueprints to Iran?