A defense official said the man, 21, was turned down for military service after failing a psychological test. Investigators are asking how he passed another such test to obtain a gun permit.

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A former student killed 10 people and then himself in a shooting in Graz on Tuesday, the police said. The authorities said a pipe bomb and a “farewell letter” were found at the shooter’s house.

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The attack in the city of Graz was among Europe’s worst school shootings in years. The police said the gunman also died, in an apparent suicide.

© Erwin Scheriau, via Agence France-Presse — Getty Images