NEW : Iran calls claim of work on nuclear bomb part `` false and not worth paying any attention to '' Papers reinforce `` deep concerns over Iran 's nuclear program , '' source says . She said the Obama administration has taken a `` dual-track '' approach to Iran , including the offer of engagement and taking part in nuclear talks . The Iranian government has dismissed a report that it is working on developing an atomic bomb, saying the claims are "false," according to Iran's official news agency IRNA. IAEA says it 's investigating document , has n't formally asked Iran for more information about it .
NEW : Iran calls claim of work on nuclear bomb part `` false and not worth paying any attention to '' Papers reinforce `` deep concerns over Iran 's nuclear program , '' source says . The Iranian government has dismissed a report that it is working on developing an atomic bomb, saying the claims are "false," according to Iran's official news agency IRNA. IAEA says it 's investigating document , has n't formally asked Iran for more information about it .