Iran, six powers push to salvage momentum for nuclear deal

VIENNA (Reuters) - Iran and six world powers re-launched talks on Tuesday to try to salvage a deal on Tehran's nuclear activity by a July deadline, striving to prevent a long-time standoff from descending into a wider Middle East war.

With time running short if a risky extension of the nuclear talks is to be avoided, negotiators face formidable challenges to bridge gaps in positions over the future scope of Iran's nuclear programme in less than five weeks.