German federal prosecutors say they suspect Wednesday's fatal shooting of two U.S. airmen at Frankfurt airport was motivated by Islamic extremism
The suspected gunman, 21-year-old Arif Uka from Kosovo, opened fire on a bus transporting U.S. Air Force members at the airport.
He is expected to appear before a judge Thursday in Germany.
U.S. President Barack Obama said he is saddened and outraged by the attack.
German Chancellor Angela Merkel expressed her condolences to the victims and their families, saying the government will do everything to find out what happened.
The government of Kosovo also condemning the shooting.