A team of nuclear inspectors from the U.N. watchdog International Atomic Energy Agency landed in Iran Sunday over allegations that the country was trying to develop nuclear weapons. The IAEA said the six-member team, which includes chief inspector Herman Nackaerts, will be there until Tuesday. Such a mission by a senior team is unusual, pointing to the seriousness of the concerns. The agency said in November that it could not verify whether the Iranian nuclear program was peaceful.