Washington - US Secretary of State John Kerry decided to join Iran nuclear talks in Geneva given progress being made in negotiations between Tehran and six world powers, a State Department spokeswoman said on Friday. "In the light of the progress being made Secretary Kerry decided to travel to Geneva to join his ministerial colleagues tomorrow should an agreement be reached," State Department spokeswoman Jen Psaki told reporters.The explanation for his travels come following the announcement that Kerry will leave for Geneva on Friday to join nuclear talks between six major powers and Iran, the State Department said."After consulting with EU High Representative (Catherine) Ashton and the negotiating team on the ground, Secretary Kerry will travel to Geneva later today with the goal of continuing to help narrow the differences and move closer to an agreement," State Department spokeswoman Jen Psaki said in a statement.