Vienna (AFP) -
Austria acknowledged Thursday there had been security failings leading up to the deadly gun rampage in Vienna by a convicted Islamic State sympathiser.
Interior Minister Karl Nehammer said the intelligence services had received a warning from neighbouring Slovakia that the assailant had tried to buy ammunition, but that 'a failure of communication' had followed.
The gunman, identified as 20-year-old dual Austrian-Macedonian national Kujtim Fejzulai, was killed by police after going on a shooting spree in Vienna on Monday evening, killing four people.
Investigators are still trying to piece together information about Fejzulai and possible accomplices after police detained 14 people in the wake of the shooting, the first major attack in Austria for decades and the first blamed on a jihadist.
The authorities now say Fejzulai acted alone after initial fears of more assailants who could be at large.
Fejzulai had been convicted and sentenced to 22 months in prison in April last year for trying to travel to Syria and join the Islamic State group.
But he was released on probation in December and had been referred to organisations specialising in de-radicalisation programmes.
The Islamic State group -- which has claimed numerous attacks in Europe -- said Tuesday a 'soldier of the caliphate' was responsible for the shooting.
The gunman opened fire indiscriminately in the historic centre of the city just hours before Austria imposed a coronavirus lockdown, when people were out in bars and restaurants enjoying a final night of relative freedom.
Security has been tightened in the city, where life was returning to normal -- albeit under the new virus restrictions -- after schools and shops had largely stayed closed after the attack.
- 'Unsafe situation' -
Nehammer told a press conference that domestic intelligence agency the BVT had been warned by Slovakia that Fejzulai was attempting to buy ammunition.
'In the next steps there was clearly a failure of communication,' Nehammer said.
He accused his far-right predecessor Herbert Kickl of having created a 'unsafe situation' in the way he treated the BVT during his one-and-a-half years in office until May 2019.
During that time the BVT 'suffered lasting damage, if not to say was destroyed', Nehammer said, adding that he wanted a commission set up to look at the functioning of the intelligence agencies.
Chancellor Sebastian Kurz has described the decision to release Fejzulai as 'definitely wrong'.
'If he had not been released then the terror attack would not have been possible,' Kurz told public broadcaster ORF on Tuesday.
- 'Fooled' the programme -
Austria's top security chief Franz Ruf told local media that at his last session of a publicly-funded de-radicalisation programme in late October, Fejzulai had condemned the recent jihadist attacks in France.
Nehammer has said the attacker had successfully 'fooled' the programmes in order to achieve his early release.
Nehammer said raids at Fejzulai's home after the attack revealed plentiful evidence of his radical views.
He referred to a Facebook post in which Fejzulai posed with the Kalashnikov and the machete he used in the attack, together with IS slogans.
- 'Why didn't they notice?' -
'Nobody would have thought him capable of something like this,' Nikolaus Rast, the lawyer who represented Fejzulai last year, told AFP on Wednesday.
He also raised questions about possible oversights by the de-radicalisation programmes Fejzulai had attended.
'Without wanting to put the blame on someone, if they are the experts, why didn't they notice anything?' Rast said.
'They must have had the most -- and the last -- contact with him.'
The organisation running the programmes, DERAD, hit back at the criticism, insisting that it had never described Fejzulai as 'de-radicalised'.
Police have carried out 18 raids and made 14 arrests over the killings, and Ruf said it was possible some of those currently being questioned by police could be accomplices.
The investigation is spanning several countries, with Switzerland making two arrests and Macedonia, where Fejzulai has family roots, cooperating with the Austrian authorities.
Kurz on Tuesday called for an EU response to 'political Islam', saying the ideology was 'dangerous' for European freedoms and values.
Kurz's office said French President Emmanuel Macron will visit Vienna on Monday to discuss 'foreign terrorist fighters, the protection of external borders and the subject of Turkey'.
The recent re-publication of cartoons of the Prophet Mohammed in France has caused new tensions worldwide, sparking protests in some Muslim-majority countries and calls from several terror groups for their followers to take revenge.
France has seen a deadly assault on churchgoers in the Mediterranean city of Nice and the beheading of a schoolteacher near Paris.