Iran has granted UN nuclear inspectors access to a high-security military site as part of efforts to avoid being brought before the UN Security Council, diplomats said Wednesday. The diplomats said experts of the International Atomic Energy Agency were allowed to revisit the Parchin site as they try to establish whether Tehran has a secret nuclear weapons program. Parchin has been linked by the United States and other nations to alleged experiments linked to nuclear arms. The IAEA has been trying for months to follow up on a previous visit in January for further checks for radioactivity in buildings and areas within the sprawling military complex. One of the diplomats - who like the others demanded anonymity because he was not authorized to talk to the media about the sensitive investigation - said that over the past few days IAEA inspectors "gained access to buildings" previously out of bounds to them.