Police board KLM flight in Cologne 24 to arrest suspects . Two suspects said to be German man , Two and German born in Cologne , early Friday . Police say `` farewell '' letters found from the men .
Police board KLM flight in Cologne early Friday to arrest suspects . Two suspects said to be Somali man , 23 and German born in Somalia , 24 . Police say `` farewell '' letters found from the men .