Police stand guard on a street in Vienna, capital of Austria, Nov. 2, 2020. (Photo by Georges Schneider/Xinhua)

Austrian investigators were on Tuesday piecing together the Monday evening rampage through central Vienna by a lone gunman and later claimed by the Islamic State (IS) group, as Chancellor Sebastian Kurz called for a European response to "political Islam."

Four people were killed when Kujtim Fejzulai, described as a 20-year-old IS sympathizer who had spent time in prison, opened fire with a Kalashnikov in a busy area of the Austrian capital the day before the country went into a new coronavirus lockdown.

IS - which has claimed numerous attacks in Europe - said Tuesday a "soldier of the caliphate" was responsible for the carnage, according to its propaganda agency.

Police shot the gunman dead on Monday and later swooped on 18 different addresses and made 14 arrests as they looked for possible accomplices and sought to determine if he had acted alone. 

After reviewing CCTV footage of the attack in an area teaming with bars and restaurants not far from the historic sights of central Vienna, Interior Minister Karl Nehammer said the video "does not at this time show any evidence of a second attacker."

Vienna police have asked people who filmed moment of the attack to share their recordings with the authorities to aid in tracking the gunman's route through the capital, rather than posting them to social media.

On Fejzulai's computer, investigators found incriminating evidence including a photograph posted on Facebook showing him carrying the automatic weapon and a machete used during the attack.

Police said he was also wearing a fake explosive belt.

Austrian Chancellor Sebastian Kurz condemned the shooting as a "repulsive terror attack," which he said killed a waitress, a young passer-by and an older man and woman.

He called on the EU to fight against "political Islam" saying it was an ideology that represented a "danger" to the model of the European way of life, in an interview published in Germany's Die Welt newspaper.

His government will face questions about how an individual known to security forces had been able to buy weapons and cause havoc on the streets of the usually peaceful capital, often listed as having the world's highest quality of life.

The investigation is spanning several countries, with Switzerland making two arrests and North Macedonia, where Fejzulai has family roots, cooperating with the Austrian authorities.

The attack came after several Islamist atrocities in France, including an assault on churchgoers in the Mediterranean city of Nice and the beheading of a school teacher near Paris.

The recent republication of cartoons of the Prophet Muhammad 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. 

AFP