German federal prosecutors investigating the fatal shooting of two U.S. airmen at Frankfurt airport said Friday there is no immediate evidence linking the suspect to an organized militant group.
Prosecutors say Arid Uka from Kosovo, 21, confessed to Wednesday's shooting before his scheduled appearance in a German court on Thursday.
Two other U.S. airmen were wounded, one critically, when the suspect opened fire on a bus transporting U.S. Air Force members at the Frankfurt airport.
The prosecutors had said they believe Uka was motivated by Islamic extremism.
On Wednesday, 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.
Kosovo's government also condemned the shooting.