Palestinian sources say an Israeli helicopter gunship fired a missile at militants during a clash in northern Gaza, killing three of them.
The Israeli army confirmed the air attack. It said soldiers spotted militants trying to launch rockets at Israel and that a gunbattle followed involving Israeli aircraft.
At least five people were wounded in the clash.
The militants involved were members of Islamic Jihad.
In other news, Israel's interior minister says four Hamas lawmakers must quit the organization if they want to continue living in east Jerusalem. Ronnie Bar-On issued the ultimatum while speaking Monday on an Israeli TV station.
He said letters were sent to the Hamas lawmakers giving them 30 days to resign or risk being expelled. Hamas' charter calls for the destruction of Israel.