Austria school shooting: What we know about Graz mass shooting

It is not yet known why a 21-year-old Austrian man committed a shooting that left 10 people dead.

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Twelve people were injured in Tuesday morning's violence, with one person dying hours later in hospital from their injuries.

The incident was the deadliest mass shooting in Austria's recent history and the country has declared three days of mourning.

Police are still investigating why the gunman - a former student who did not graduate - carried out the attack.

Here is what we know so far.