In a statement, the Interior Ministry, which is still dominated by Hamas, said it had informed Fatah it could not provide security for the rally.
Faisal Abu Shala, a Fatah official in Gaza, confirmed the cancellation.
"We cancelled the event because Hamas told us on the political and security level that they can't secure the event," he said.
At the previous memorial, held months after the Hamas takeover, at least 10 people were killed in clashes.
In the spring, the two Palestinian factions worked out a tentative agreement in which President Mahmoud Abbas of Fatah would head a temporary unity government of apolitical technocrats until new elections could be held.
But the deal left many major issues unresolved, and Hamas remains firmly in control of Gaza.
Hamas has denied involvement, and claims the explosions were the result of internal bickering between rival factions inside Fatah.
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