Israeli troops shot and killed two Palestinian militants in a gunbattle that broke out during a cross-border raid into the Gaza Strip early Tuesday.
Palestinian medics identified the dead men as Hamas militants Abdul Karim Shaath and Mohammed Muamar. They said Israeli troops also arrested two other men.
In the West Bank, the Israeli army said it arrested four wanted men in an overnight raid in the refugee camp of Balata.
Palestinians say the detainees include Jamal Tirawi, a member of the Palestinian parliament and all are members of the Fatah faction of Palestinian President Mahmoud Abbas.
Monday, an Israeli airstrike destroyed a building used by Hamas in the northern Gaza, after Palestinian militants fired nearly 10 rockets into southern Israel, injuring one person.
Hamas militants have kept up their rocket attacks, despite an appeal from President Abbas to renew a ceasefire with Israel in Gaza that collapsed more than week ago.
On Monday in Ramallah, Israel's special forces arrested senior commander Khaled Shawish of the Fatah affiliated al-Aqsa Martyrs Brigades militant group.
Israel has carried out daily air strikes for more than a week and has also threatened broader military operations in Gaza if Palestinian militants do not stop their rocket attacks.
Nearly 50 Palestinians - mostly militants - have been killed in Israeli airstrikes. Palestinian rockets have killed two Israelis since May 15.
Some information for this report was provided by AP.