1. After a terrorist has 'gone geological' (lol), his organization invariably calls up the local TV station and presents the bombers last video containing his picture his family and his last prayers and blessings. I don't think that figuring out what continent he was from compares with that as a part of the identification process.
2. If the CIA or Interpol has followed a group of suspected terrorists to a location, then they already know who they are. They don't just go looking for strangers with 'terrorist' tattooed on their forehead.
News 
Market Data 
Discover 
