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Austria has one of the most heavily armed civilian populations in Europe, with an estimated 30 firearms per 100 people.

Authorities said the men were surprised by a resident in the home and ran from the location, but one of them shot a firearm inside the house, striking one of the suspects.

Current information suggests the shooter legally owned the two guns used in the attack - a pistol and a shotgun - and had a firearms licence, police said.

Current information suggests the shooter legally owned the two guns used in the attack and had a firearms licence, police added.

The Graz gunman is understood to have owned both firearms legally, and he had no criminal record.