Ex-U.N. nuclear chief Blix cautious on Iran deal hopes

By Karin Strohecker and Marc Jones LONDON (Reuters) - Hans Blix, former chief of the UN nuclear watchdog, said he was cautious about the chances of a final deal being clinched between Iran and major world powers aimed at reining in Tehran's nuclear program. Following more than a decade of brinkmanship, eight days of marathon talks in Lausanne this month ended with an outline deal to scale back Iran's program for at least a decade. The tentative agreement clears the way for negotiations on a fina