Terrorism from foreign groups became an increasingly major concern , as with the 1992 al-Qaeda attack in Yemen , the 1993 truck bombing of the World Trade Center , the 1995 Khobar Towers bombing in Saudi Arabia and the 1998 bombings of the US embassies in Dar es Salaam , Tanzania and Nairobi , Kenya
1993 truck bombing of the World Trade Center
1993 World Trade Center bombing
Signals intelligence in modern history