VIENNA - Six world powers and Iran began their fifth round of nuclear negotiations on Tuesday in hopes of salvaging prospects for a deal over Tehran's disputed atomic activity by a July deadline.

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

Without a deal, the Middle East would face the risk of another war if Israel - which views a nuclear-armed Iran as an existential threat - attacks the Islamic Republic's nuclear installations.

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