The left-wing Popular Front for the Liberation of Palestine (PFLP) marked its 43rd anniversary on Saturday with a call on rival Hamas and President Mahmoud Abbas' Fatah party to reconcile.
Despite stormy weather in the Hamas-ruled Gaza Strip, thousands of PFLP supporters gathered at the city's main stadium, waving red flags and chanting slogans for Palestinian unity.
The group, which opposes the peace accords signed with Israel, is the second-biggest faction in the Palestine Liberation Organization (PLO). It slammed both Fatah and Hamas for not reconciling.
Jamil Majdalawi, a senior PFLP leader, told the crowds that Abbas should undertake a comprehensive policy review, especially in relation to the future of the peace process with Israel.
"The ongoing Palestinian split that resulted from Hamas-Fatah disputes was a hard and complicated moment," said Majdalawi. "People with vested interests are happy with the political division between Gaza and the West Bank."
He said there was a need to rebuild the PLO "since it has become clear that the peace process is in deadlock."
"As long as the Israeli occupation of Jerusalem and the West Bank continues, the Palestinian leadership needs to review all its policies and achieve unity," Majdalawi said.
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