Palestinian Fatah movement denounced on Saturday Hamas politburo chief Khaled Mashaal's verbal attacks on Fatah and it's leader Palestinian President Mahmoud Abbas.

Palestinian chief negotiator and senior Fatah official Saeb Erekat told Voice of Palestine that Mashaal's speech was "very dangerous", calling on Hamas to "unsay it immediately and shoulder its duties."

Addressing a gathering marking the anniversary of the death of Hamas spiritual leader Ahmed Yassin held in Syrian capital of Damascus on Friday, Mashaal accused Abbas and his Fatah movement of corruption and plotting against Hamas.

"I'm forced to counter these dangerous remarks which push our people towards civil war," said Erekat, responding to Mashaal's accusations.

Meanwhile, al-Aqsa Martyrs Brigades, an armed wing of Fatah,also slammed Mashaal's speech on Saturday.

"We strongly condemn Mashaal's offensive statements against Fatah which has headed the Palestinian struggle for decades," Abu Thaer, the spokesman for the group, told a news conference held in Gaza.

"While rejecting these accusations, we want the government to explain whether Mashaal's remarks were his own, Hamas or the government's attitude," added Abu Thaer.

Fatah supporters and militants also took to the streets in the West Bank and the Gaza Strip to protest against Mashaal's speech.

Hamas, which came to power in late March after its parliamentary win in January, has been engaged in power sharing disputes with Abbas, whose Fatah lost control in both the Palestinian parliament and cabinet.