A military intelligence officer also told a parliamentary committee he could not rule out the possibility that the Lebanese fundamentalist Shiite movement Hezbollah could acquire non-conventional weapons from Iran, military radio reported.
The officer said Iran's activities -- which he did not specify -- contravened commitments by Tehran to the UN nuclear watchdog the International Atomic Energy Agency.
Iran has announced it would resume the assembly of centrifuges -- used to enrich uranium in the most sensitive part of the fuel cycle -- but said it was committed to an accord to allow tougher IAEA inspections, make a full declaration of its activities and suspend enrichment itself.
The IAEA is probing allegations that the country is using power generation as a cover for a secret weapons drive but Tehran insists its programme is solely aimed at meeting the future energy needs of a burgeoning population and freeing up its oil and gas resources for export.
Israel's military intelligence chief General Aharon Zeevi Farkash said earlier this month he believed Iran could build a nuclear weapon by 2007.
Unlike Israel, which is widely thought to possess up to 200 nuclear warheads, Iran has signed up to the IAEA's nuclear non-proliferation treaty (NPT).