Law enforcement officials tell CNN the FBI is running through its database of thumb prints of the two passengers who used stolen passports to board the missing Malaysian jet that vanished over Southeast Asia three days ago.
The thumb prints were taken at the airport check-in in Kuala Lumpur and were shared with intelligence and law enforcement agencies around the world by the Malaysian government.
There's still no sign of Flight 370 or any of the 239 people on board the plane.
The search is unprecedented, and currently, nearly three dozen aircraft and 40 ships from 10 countries are participating in the search.
And still, not even the smallest sign of the missing jet. Search and rescue officials now say they are expanding the search area.
Earlier, sightings of oil slicks, possible plane debris and what looked like a yellow life vest turned out to be unrelated to the plane.
It's been a frustrating search and an agonizingly painful wait for the families of the missing.
And still, so many questions remain unanswered.
How does a Boeing 777 just disappear without a trace?
Who are the two men believed to have used stolen passports to board the plane?
And was this an act of terror?
OutFront: Former NTSB Chairman Jim Hall and Former Chief of Staff at the Department of Defense & the CIA, Jeremy Bash.