Israeli forces shot dead a father and his son when they raided a house in Gaza, and a third Palestinian was killed by troops near a Gaza border crossing.
In the first incident, Israeli troops backed by helicopters entered the northern Gaza town of Beit Hanoun and engaged in heavy clashes with Palestinian gunmen there.
Residents said the operation targeted the house of a member of Hamas. A Palestinian father and his son were killed and at least four others were wounded.
The army said two gunmen opened fire on Israeli forces from within the building, prompting troops to return fire.
A spokesman added that two Hamas militants wanted for firing rockets into Israel and setting off explosives were also arrested by Israeli special forces from the house.
The house was later demolished by an army bulldozer.
At the same time, Israeli air strikes in a nearby part of Beit Hanoun wounded three Palestinians, two of them children, with shrapnel.
In the second incident, the Israeli army said it had shot a man south of the Kisufim border crossing in central Gaza overnight.
They said the man looked like he intended to infiltrate Israel. Palestinian medics recovered the body.