An Israeli security chief says he is "very concerned" that hardline extremists could assassinate an Israeli leader to foil peace moves with the Palestinians.

Shin Bet internal security agency head Yuval Diskin says "a group in the extreme right" is prepared to assassinate politicians "in order to halt diplomatic processes." Diskin spoke Sunday at the weekly meeting of the Israeli Cabinet.

His statement was released by another meeting participant who spoke on condition of anonymity because the session was closed.

This week, Israel marks the 13th anniversary of the assassination of Prime Minister Yitzhak Rabin by an Israeli extremist.