sentences:  While with the DSS, Burton was appointed by Washington to assist in the investigation of the assassination of Israeli Prime Minister Yitzhak Rabin.He also investigated the killing of Rabbi Meir Kahane; the al Qaeda New York City bombing plots before the September 11 attacks; and the Libyan-backed terrorist attacks against diplomats in Sana'a and Khartoum.He was involved in the arrest of Ramzi Yousef, the mastermind of the first World Trade Center bombing in 1993.