Here are the latest developments involving negotiations between Iran and world powers over the Islamic Republic's contested nuclear program in Vienna (all times local):

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7:30 a.m.

A diplomat says a deal between Iran and world powers over the Islamic Republic's contested nuclear program is likely to be announced by Tuesday afternoon in Vienna.

Another diplomat told The Associated Press that final drafting of the deal was still going on at daybreak Tuesday.

The diplomats spoke on condition of anonymity as negotiations remained in flux.

The talks are aimed at reaching a final deal to limit Iran's nuclear program in exchange for lifting economic sanctions. Iran long has said its nuclear program is for peaceful purposes. The West fears it could be used to build an atomic bomb.

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Associated Press writers George Jahn and Matthew Lee contributed to this report.