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But witnesses said one pushing match was between supporters of Palestinian President Mahmoud Abbas and partisans of Fatah’s former Gaza security commander Mohammed Dahlan, who was expelled from the party because of conflicts with Abbas.

Another Fatah official, who spoke anonymously because he did not want to embarrass the party, said the rally was cancelled because hundreds of Dahlan supporters jumped up on the stage and clashed with Abbas supporters.

Fatah spokesman Fayez Abu Etta attributed the injuries to overcrowding and the excitement of the rally.

Overnight, throngs had camped out in a downtown Gaza square to ensure themselves a spot for the anniversary commemoration of Fatah’s 1965 founding, and tens of thousands marched early Friday carrying Fatah banners. When the rally began, people stampeded to the stage to try to shake leaders’ hands.

Hamas was not directly involved in the event but allowed it to take place. Top Fatah officials arrived in Gaza for the first time since they were ousted from Gaza by Hamas in 2007.

Abbas, who rules in the West Bank, did not attend the event, but spoke to the crowd via a televised address, telling them that “there is no substitute for national unity.”

Organizers then ended the rally, cancelling the other planned speeches and musical performances.

Hamas has gained new support among Palestinians following eight days of fighting with Israel in November, during which Israel pounded the seaside strip from the air and sea, while Palestinians militants lobbed rockets toward the Israeli cities of Jerusalem and Tel Aviv for the first time.