Iran on Monday called a recent report by the United Nation's nuclear watchdog on its nuclear activities "fully biased" and "politically motivated".

The Iranian Foreign Minister says he has spoken by phone with the director of the U.N.’s nuclear watchdog agency after a report from the agency said Iran is further increasing its stockpile of uranium enriched to near weapons-grade levels.

Iran carried out secret nuclear activities with material not declared to the U.N. nuclear watchdog, the confidential report said.