Three Palestinians - including a wheelchair-bound man crippled in the 1987 intifada - have been shot dead by Israeli troops in separate incidents.
Yakub died when troops fired at stone-throwing protesters
The Israeli army said a 17-year-old died when troops opened fire at a "suspicious-looking" figure at night in Khan Yunis, in the Gaza Strip.
Earlier, troops opened fire to disperse protesters in Kalandia, in the West Bank, killing the man in a wheelchair.
The army said the protesters were throwing stones near an airport.
The man - Arafat Ibrahim Yakub, 31 - suffered fatal head wounds, Palestinian sources said. He had been confined to a wheelchair since being wounded in the first intifada in 1987.
A mentally disturbed man was shot dead by troops on Monday near the West Bank town of Qalqilya, Palestinian sources said. The incident reportedly happened near Israel's separation barrier.
The Palestinian youth killed on Sunday in Khan Yunis, near the Jewish settlement of Neve Dekalim, was named as Mohammed Nabahan.
The army said he had ignored warning shots and calls to stop.
Palestinian radio said Israeli forces also arrested seven people during raids overnight in the Balata refugee camp in the West Bank town of Nablus.