NABLUS, West Bank ? Masked gunmen loyal to Yasser Arafat broke up a conference of reformers from his Fatah movement who were calling for a “revolution,” as the veteran Palestinian leader faced new divisions among his people.

The incident in the West Bank city of Nablus was just the latest in weeks of internal Palestinian unrest. The unrest centers on charges of widespread corruption in Arafat’s administration, and beneath the surface, frustration with lack of progress toward creation of a Palestinian state or economic development after four years of bloody conflict with Israel.

Early today in Gaza, Israeli forces entered the Khan Younis refugee camp. As bulldozers destroyed a building, soldiers opened fire, and a woman was killed when a bullet came in through her window, residents said. Six other civilians were wounded, doctors said.

Military sources said the operation was aimed at the “terrorist infrastructure” in the camp. The sources, speaking on condition of anonymity, said militants used the location to fire mortars and rifles at a nearby Jewish settlement.

Less than a week after Arafat ended a crisis in the Palestinian Cabinet, he was again under pressure for changes from among his own supporters, although there was no suggestion Arafat himself should go.

About 20 men, all armed and many wearing ski masks, burst into a conference of more than 70 Fatah officials, firing over the heads of the presiding officials and claiming that the conference was an anti-Arafat conspiracy.

The weeklong meeting was meant to discuss reform and new elections for the Fatah leadership, which last took place 15 years ago.

No one was injured by the gunfire, but the meeting broke up. Several delegates met with the gunmen to discuss whether the conference could continue.

The gunmen identified themselves as members of the Al Awda Brigades, a small militant group.

In a letter released later to reporters, the Fatah leaders warned Arafat that corrupt officials “are using their position in the Palestinian Authority to steal and to break the law,” and that the Palestinian government was losing the public’s trust.