1: Although al Qaeda was behind the 1998 attack that killed more than 200 people , Al-Shabaab has killed many more Kenyans and is by far the country 's most persistent tormenter , according to a University of Maryland study . 2: In short succession , bombs detonated at U.S . embassies in Kenya and Tanzania back then . 3: Al Qaeda 's 1998 attack on the U.S. Embassy is the single largest , but Al-Shabaab have killed many more Kenyans .
1: the 1998 attack 2: bombs 3: Al Qaeda 's 1998 attack on the U.S. Embassy