Israeli Minister Vacates Home After Assassination Warning
Israeli security agencies have been on alert for possible threats to senior Israeli political and military figures since the assassination on Oct. 17 of Rehavam Zeevi at a Jerusalem hotel. The militant Popular Front for the Liberation of Palestine claimed responsibility for that killing, calling it revenge for Israel's assassination of the group's leader, Mustafa Zibri, known as Abu Ali Mustafa, in a helicopter missile strike on his headquarters in August.

The killing of Mr. Zibri, a senior official in the Palestine Liberation Organization, marked the first time Israel had assassinated the head of a Palestinian faction as part of its policy of killing suspected militants. Israeli officials said that Mr. Zibri had organized terrorist cells responsible for several car bombings, but Palestinian officials called him a political figure, and warned of retaliation in kind.
http://www.nytimes.com/2001/11/10/international/middleeast/10MIDE.html