The bloody attack in Vienna was preceded by a lack of communication regarding the information sent to Austria by the Slovak police, Austrian Interior Minister Karl Nehammer acknowledged, informs dpa and Reuters.

Nehammer confirmed that the Austrian Bureau for Constitutional Protection and Counter-Terrorism (BVT), responsible for internal security and counterintelligence, was informed by the Slovak side in July that Kujtim Fejzulai, who killed four people and injured another 20 months in the evening in the center of Vienna, in a burst of gunfire, he had tried to buy ammunition in Slovakia.

“Something seems to have gone wrong in the communication steps that followed,” Nehammer told a news conference.

He announced that a commission would be set up on the issue, as well as on the fact that Fejzulai had been released from prison earlier.

Fejzulai had been sentenced to 22 months in prison last year after trying to join Islamist fighters in Syria. He was released on parole in December and participated in a deradicalization program.

According to the Austrian minister, a video recording confirms that Kujtim Fejzulai acted alone during the attack in Vienna.

Kujtim Fejzulai killed four people and injured more than 20 on Monday night in an armed attack in the Austrian capital, before Austrian police shot him dead.

The young man, who killed four people in Vienna on Monday and injured more than 20 before being killed by police, had expressed increasingly extremist religious beliefs before the attack, according to his adviser in his de-radicalization program. transmits Thursday dpa.

The adviser, who works for the non-profit organization Derad, reported this development to the judicial authorities, Derad co-founder Moussa Al-Hassan Diaw told dpa.

However, the counselor did not notice any signs that the young man was planning a bloody attack, Diaw added, stressing that these officials cannot be found guilty.

Attacker Kujtim Fejzulai served a prison sentence last year for attempting to join the Islamic State in Syria, but was released in December on condition of cooperating with police officers and Derad.

Austrian Chancellor Sebastian Kurz criticized Fejzulai’s early release, calling it a mistake, while Interior Minister Karl Nehammer said he had misled Derad about his de-radicalization.

Diaw rejected the idea, saying that “there was no misleading, as our colleague never found that the man was de-radicalized.”

On the contrary, Fejzulai’s adviser remarked to him that he was developing doubts about his own faith, which is even worse than accusing others of losing her, Diaw said.

“This self-doubt often leads to despair,” he commented, explaining that some people who experience such feelings turn to prayers, violent actions, or thoughts about their own death.

Minister Nehammer acknowledged on Wednesday that mistakes had been made after it was learned that Austria had received information from Slovakia in July that Fejzulai had tried to buy ammunition from the country.

So far, more than 10 people have been arrested for alleged links to the terrorist attack.