The announcement came after a meeting in Ramallah in the occupied West Bank of the Executive Committee of the Palestine Liberation Organisation (PLO) under Mahmud Abbas's presidency.
"The Executive Committee has decided to start preparations for presidential and parliamentary elections in the coming months... no later than September," the committee secretary Yasser Abed Rabbo told journalists.
The PLO, which groups the main Palestinian nationalist movements, has been under Abbas's leadership since 2004.
Abed Rabbo called for "all Palestinian factions to set aside their reservations, notably their differences," a reference to the Islamist Hamas group ruling the Gaza Strip since it ousted Abba's secular Fatah in 2007.
But a Hamas spokesman swiftly rejected the call for elections.
"This procedure is invalid because president Abbas has no legitimacy and is not fit to organise such elections," Fawzi Barhum said in Gaza City.
Hamas won the last Palestinian legislative elections in January 2006.
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