VIENNA: US Secretary of State John Kerry will travel to Vienna this weekend and seek to bridge “significant gaps” in ongoing nuclear talks between Iran and world powers, the State Department said on Thursday (Friday in Manila). Kerry “will gauge the extent of Iran’s willingness to commit to credible and verifiable steps that would back up its public statements about the peaceful nature of its nuclear programme,” spokeswoman Marie Harf said in an emailed statement. He “will see if progress can be made on the issues where significant gaps remain and assess Iran’s willingness to make a set of critical choices at the negotiating table,” she added. The talks between Iran and the five permanent members of the United Nations Security Council plus Germany, which began last week, are aimed at forging a lasting deal with Iran meant to ease fears that the Islamic state might develop nuclear weapons. The deadline to get a deal is July 20.