Four men are now in Israel's sights. Two – Yasser Arafat and Palestinian intelligence chief Tawfik Tirawi – are under siege in Ramallah. The other two are running for their lives with Israeli intelligence services on their heels Fatah-Tanzim militia chief Marwan Barghouti and Rashid Abu Shbak, deputy to Gaza preventative security chief Mohammed Dahlan. These manhunts take time. Palestinian bombmaker Yahya Ayyash was not caught in a day, while the world's most wanted fugitive, al-Qaida's Osama bin Laden, and his senior lieutenant, Imad Mughniyeh, continue to elude the most intensive pursuits. A senior Israeli security source, asking to remain...