TEHRAN, Jan. 11 (UPI) -- The top U.N. nuclear official arrived Friday in Tehran to discuss outstanding issues related to the country's nuclear program.

WASHINGTON, July 9 (UPI) -- U.S. Intelligence experts said they fear Iran may try to thwart future military strikes against its nuclear facility by placing key parts underground.

PYONGYANG, North Korea, June 28 (UPI) -- U.N. nuclear inspectors arrived at North Korea's atomic plant in Yongbyon Thursday and announced a July date to begin monitoring its closure.

VIENNA, June 25 (UPI) -- An International Atomic Energy Agency team has been invited by Iran to help the Middle Eastern nation clarify its nuclear program to the rest of the world.

VIENNA, Jan. 5 (UPI) -- Iran canceled a meeting Thursday with the International Atomic Energy Agency that was set up so it could explain its decision to restart critical operations.

ISLAMABAD, Pakistan, March 26 (UPI) -- The International Atomic Energy Agency has sought Pakistan's permission to inspect some of its nuclear installations, The News daily of Pakistan reported. Spokeswoman and senior information officer Melissa Fleming said the IAEA wants to know from Pakistan

KINSHASA, Democratic Republic of Congo, March 25 (UPI) -- Suspicious activity at a uranium mine in the Democratic Republic of Congo has spawned a U.N. investigation, the BBC reported Thursday.

VIENNA, Nov. 21 (UPI) -- The IAEA, contending with the United States and Europe, Friday delayed passage of a resolution to rebuke Iran for its secret nuclear program, says a report.

WASHINGTON, May 26 (UPI) -- An Iranian opposition group scheduled a news conference for Tuesday to release new details on Teheran's alleged nuclear weapons research program at a time when talk of instituting a regime change in Iran has reportedly been picking up steam. The Nation