Israeli troops shot and killed two leading Palestinian militants near the West Bank town of Jenin on Monday.
Palestinian officials said the men were shot as they rode on a tractor on the road leading from the village of Burkin to Jenin.
The Palestinians accused Israel of carrying out a targeted attack on the men. One of the dead, Shaman Sobih, was reported to be a senior Hamas militiaman and was said to be on Israel's wanted list. The second man was identified as Mustafa Fast a member of Yasser Arafat's Fatah faction.
Elsewhere, Palestinian security officials and hospital workers said a half-dozen Israeli tanks and an armored bulldozer moved into the Rafah refugee camp in the southern Gaza Strip on Monday.
According to Palestinian witnesses two Palestinians were wounded by gunfire and the bulldozer destroyed two vacant houses and three olive groves. The Israeli army said it was checking the report.