The Israeli military said the arrests early on Sunday were still underway, and would not specify how many Palestinians were taken into custody.


Israel Radio said more than 80 members of the Hamas and Islamic Jihad movements had been detained.


The arrests were being carried out as Israel embarked on an offensive against Hamas fighters in the Gaza Strip who bombarded Israeli towns with rockets.


The offensive crushed hopes that Israel's recently completed Gaza pullout would jumpstart peace talks, and intensified pressure on Palestinian leader Mahmoud Abbas.