A former security guard who used to work at the U.S. embassy in Oslo has been charged with spying for Russia and Iran, Norwegian media reported on Wednesday.

Oslo prosecutors accuse the man, a Norwegian national, of serious espionage activities related to the U.S. and Norway, public broadcaster NRK reported.

He is said to have passed on a blueprint of the embassy, addresses and other information to Iranian and Russian contacts, according to the indictment.

The 27-year-old, who was reportedly arrested in November, recognises the facts laid out by the charges but denies criminal guilt, his defence lawyer told TV 2.

The trial has been scheduled to begin in mid-August. If convicted, the defendant faces up to 21 years in prison. (dpa/NAN)