That's after authorities analyzed more than 20,000 mobile phone videos handed in by the public.

The country's chancellor has called it a terror attack, the deadliest in Austria's capital for decades, where the gunman opened fire on crowds and bars until he was shot dead by the police.

The Austrian interior minister, Carl NeJame Er, said on Wednesday that Austria had fumbled intelligence on the gunmen and that they would be investigating their own actions.

We can't in fished in this.

Following mounting evidence from the investigations, video was able to confirm the lone assailant theory at the same time, the video showed us the extent of the brutal and horrific way the assailant carried out his attack.

The 20 year old gunman had already been convicted in Austria for trying to join the Islamic state in Syria In July, NeJame ER said Austria had received intelligence suggesting the attacker tried and failed to buy ammunition in neighboring Slovakia.

NeJame a repeated criticism of a de radicalization program, saying the gunman had perfectly fooled the program, convincing them he no longer held jihadist beliefs.

Imam Demir Ramadan has worked as a prison chaplain and warns against extremism in prisons.

On this Gonzaga, In the prisons, things are really becoming a hotbed of radicalization.

We have to do everything together, government and society to de radicalize on protect the majority of Muslims from this.

Austria's National Security Council signed off on setting up an independent inquiry commission later on Wednesday.

Neutral Austria, part of the US led coalition formed in 2014 to defeat Isis, has for years described jihadist attacks as its biggest national security threat.

At the end of 2018, authorities knew of 320 people from Austria who were tied to extremism in Syria and Iraq.