the cardinal who led the service at the historic cologne cathedral urged forgiveness for all of the victims - including co-pilot andreas lubitz who is widely blamed for ` deliberately ' crashing the jet after locking the captain out of the cockpit .
an investigation into the disaster revealed that lubitz previously suffered from severe depression and his home computer showed he had researched ways of committing suicide .
german president joachim gauck said the tragedy had not only provoked grief and sorrow , adding : ` we 're being confronted with a disturbing act of destruction .