Iran is serious about developing a nuclear bomb and has the ability to produce a primitive, truck-sized version of the bomb this year, the German magazine Der Spiegel reported on Monday.

An intelligence dossier obtained by Der Spiegel shows that there is a secret military branch of Iran's nuclear research program that answers to Tehran's ministry of defense, according to the report.

Officials who have read this document - which is currently under review by the U.S., Germany and Israel - claim that it shows that their nuclear program aimed at producing a bomb is well advanced.

The officials said to Der Spiegel that the truck-sized bomb which they are capable of producing will have to be compressed to a size that would fit into a nuclear warhead for the strategic threat potential they desire.

Der Spiegel also wrote that Israel and the West were alarmed by the dossier's revelations, as Iran could reach the compressed level of a nuclear bomb between 2012 and 2014.

Tehran has consistently denied that it is enriching uranium for weapons, claiming it is exclusively dedicated to the peaceful use of nuclear technology.

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