An army statement said 20-year-old Elkana Navon "fell during operational activity" on Saturday and that another soldier was "severely injured" in the same incident, without providing details.

Since Wednesday at least 22 Palestinians have been killed by the Israeli army in simultaneous raids in several cities in the northern West Bank.

Since Friday, soldiers have concentrated their operations on the city of Jenin and its refugee camp, long a bastion of Palestinian armed groups fighting against Israel.

The United Nations said on Wednesday that at least 637 Palestinians had been killed in the territory by Israeli troops or settlers since the Gaza war began.

Twenty Israelis, including soldiers, have been killed in Palestinian attacks or during army operations over the same period, according to Israeli official figures.

Of the 22 Palestinians reported dead since Wednesday, Hamas and its ally Islamic Jihad have said at least 14 were members of their armed wings.

Earlier on Saturday, Hamas issued a statement saying one of its fighters carried out an "ambush" using "a highly explosive device" in the Jenin refugee camp "which led to the deaths and injuries of members of the advancing (Israeli) force".