Tehran, July 23 (IANS) The extension of talks on Iran's nuclear programme is an indication of a "political will" on both sides toward reaching a final agreement, an Iranian official said Wednesday. The next four months are an extension of the course which started in Geneva last **vember, Xinhua cited Iran's foreign ministry spokeswoman Marzieh Afkham as saying. "The core issues around Iran's nuclear programme were discussed and negotiations became more complicated and more difficult," Afkham said. The Iranian nuclear talks would be extended for four more months till **v 24, European Union (EU) foreign policy chief Catherine Ashton and Iranian Foreign Minister Mohammad Javad Zarif said Saturday.