Israeli troops have shot dead a Palestinian militant in a raid on a refugee camp in the northern West Bank.
Aqsa Martyrs called the killing a clear violation of the current truce
Ibrahim Smeri, 23, was killed by members of a special unit disguised as Arabs, Palestinian sources said.
The circumstances of the shooting are unclear. The army said its troops were returning fire and one soldier's flak jacket was struck by a bullet.
Residents in Balata camp said the Israelis opened fire without warning and then took the body away.
Palestinian sources identified Smeri as a member of the al-Aqsa Martyrs Brigades, a violent group linked to Palestinian leader Mahmoud Abbas's Fatah faction.
The group's leader in Balata camp said the shooting violated an informal ceasefire between Israel and Palestinians.
"This assassination is a clear violation of the Israeli ceasefire," Ala Sanekri is quoted as saying by AFP news agency.
"We are now discussing in the al-Aqsa Brigades whether to continue with the ceasefire and we will make a decision in the coming hours."
It was the first killing of a militant by Israel for more than a month.
Last week Israeli troops killed three Palestinian youths near the border between Gaza and Egypt, sparking a barrage of mortar fire aimed at Jewish settlements.