Iran is committed to securing a nuclear agreement with world powers but will **t sign one "at any price", its negotiators said Monday, as a key deadline for Tehran nears. Iran and the five permanent members of the UN Security Council plus Germany -- k**wn as P5+1 -- signed an interim deal last **vember and are in discussions to secure a more permanent accord. "We are entering with goodwill into further negotiations with the P5+1 group and we want to reach an agreement... but we are **t willing to pay any price," ISNA news agency quoted Majid Takht-Ravanchi, one of Iran's main negotiators, as saying. By August 25 Tehran must also respond to the International Atomic Energy Agency (IAEA) on decade-old allegations of past nuclear ******* research.