Palestinian President Mahmoud Abbas rejects Hamas claims that members of his Fatah movement are behind a bomb attack that killed five Hamas militants and a girl in Gaza.
He called Sunday for dialogue with the Islamist group and expressed support for a independent committee to investigate the blast.
"We would accept any decision that would result from this investigation committee because we do not accept the ugly actions that took place in Gaza," Abbas said in Cairo following a meeting with Egypt's President Hosni Mubarak.
"What happened was very regretful and painful to our people and we do not accept it at all," he said.
"At the same time, we do not accept accusations and counter accusations and the direct insinuations by Hamas to accuse Fatah ... of responsibility for what happened."
A Hamas spokesman said Sunday that Abbas's call for dialogue wasn't honest.
Friday's bombing destroyed a car, killing the six and wounding 20 others.
Hamas has launched a crackdown on Fatah supporters in Gaza in response to the bombing, rounding up more than 160 people. By Sunday, about a dozen had been released.
Islam Shahwan, a Hamas police spokesman, said his men seized "huge amounts" of explosives and weapons from Fatah in Saturday's operations.
In the West Bank, Fatah security forces have detained 20 Hamas supporters.
Hamas seized control of Gaza following a brief civil war in June 2007. It has always rejected demands that it relinquish control of Gaza as a precondition for talks.
With files from The Associated Press
