Iran sought on Sunday to blunt potential international action over its contentious nuclear program, labeling as baseless a UN nuclear watchdog report that it had received blueprints for building the core of an atomic weapon. The 35-member board of the International Atomic Energy Agency meets on Thursday and could refer Iran to the UN Security Council for possible sanctions. In a preparatory report, the UN agency found that Iran received the detailed designs from the network run by Abdul Qadeer Khan, the father of Pakistan's nuclear program. His network supplied Libya with information for its now-dismantled nuclear weapons program that included an engineer's drawing of an atomic bomb. "This is just a media speculation," said Hamid Reza Asefi, Iranian foreign ministry spokesman. "It is baseless."