While in Switzerland, John Kerry is hoping to seal a framework deal to roll back Iran's nuclear program in exchange for sanctions relief. Photo: Wikimedia Commons.

ABC News/AP – US Secretary of State John Kerry is back in Switzerland to resume Iran nuclear talks as negotiations go down to the wire against an end-of-month deadline for the outline of a deal.

With just days until that target is reached, Kerry touched down in Geneva late Wednesday and was driven to the lake resort of Lausanne. En route to Geneva, US officials said the deadline is achievable but remains uncertain amid significant gaps in certain areas.

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