Al Qaeda attacks on US interests between 1st and 2nd WTC events,
source:
4 October, 1993 Eighteen US servicemen killed in Somalia
25 June, 1996 US military base in Saudi bombed 19 servicemen killed
7 August, 1998 US embassies in Kenya and Tanzania bombed
12 October, 2000 Attack on US warship in Yemen kills 17 sailors
Al Qaeda attacks on US interests after 9/11:
18 June, 2004 US engineer beheaded in Saudi Arabia