Israeli troops killed a Palestinian man during a violent demonstration in the West Bank village of Naalin, Palestinian medics and witnesses said on Friday.
Hospital staff said Yussef Aqil Srour died from a chest wound that appeared to have been caused by live fire.
Witnesses said troops fired tear gas, rubber bullets and possibly live rounds at rock-throwing demonstrators in the village.
An army spokesman said the Israeli army was investigating the report on Friday.
Elsewhere in the West Bank on Friday, demonstrators protesting against the construction of Israel's separation barrier clashed with Israeli troops.
Protesters in the village of Bilin hurled stones towards the barrier and the Israeli soldiers guarding it.
Israeli soldiers retaliated with firing tear gas, but no injuries were reported.
Villagers have protested at the barrier every Friday for the past two and half years, routinely sparring with police in clashes which have wounded dozens.
Israel began building the barrier, a combination of concrete walls, fences, trenches and patrol roads along the West Bank in 2002, saying it was a necessary weapon in its war against Palestinian suicide bombers.
But the barrier juts into swathes of the occupied West Bank, provoking Palestinian claims that Israel is using security arguments to grab land that could be part of a future independent state of Palestine.
Just under two-thirds of the barrier's planned final length of 790 kilometres (490 miles) has so far been completed, according to Israel's Defence Ministry.