Iran on Sunday threatened to cancel the nuclear deal with world powers unless a probe into allegations of its past weapons research is closed, AFP reported.<br />The declaration, by a top Iranian security official, comes after the head of the UN nuclear watchdog said a report into the possible military dimensions of Iran's activities would not be "black and white."<br />Iran has always denied seeking to develop an atomic weapons capability, insisting its nuclear program is for peaceful energy production and medical purposes only.
