The leaders of two groupings in the Aq’sa Martyrs Brigades in the West Bank city Tul Karem were killed in a shoot-out late on Saturday.
The in-fighting between the senior members of the Arafat-backed brigades, followed violence in Gaza late last week.
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Fighting broke out there between Palestinian Authority loyalists and Hamas supporters.
The unrest began when Hamas members kidnapped a police officer and in response the Palestinian Authority arrested seven Hamas operatives.
During the violence a Hamas member opened fire and injured two civilians. He says he thought they were police officers.