Gunmen attacked six locations in central Vienna, Austria’s capital on Monday, killing at least three people and wounding over a dozen.
One suspect was shot dead by police and a manhunt was launched for at least one more, officials said.
Interior Minister Karl Nehammer described the assailant killed by police as an “Islamist terrorist”.
“According to what we currently know, at least one perpetrator is still on the run,” Nehammer said.
“We have brought several special forces units together that are now searching for the presumed terrorists. I am therefore not limiting it to an area of Vienna, because these are mobile perpetrators,” Nehammer earlier told ORF.
Kurz said the army would protect sites in the capital so the police could focus on anti-terror operations. Speaking to ORF, he said the attackers “were very well equipped with automatic weapons” and had “prepared professionally”.
Austrian officials have not released any details about the attackers or the potential motive for the Vienna attack, although Chancellor Sebastian Kurz said an anti-Semitic motive could not be ruled out.
Police sealed off much of the historic centre of Vienna, urging the public to shelter in place. Many sought refuge in bars and hotels, while public transport throughout the old town was shut down and police scoured the city.
The attack happened just hours before Austria imposed new national restrictions to try to stem rising cases of coronavirus. Many people were out enjoying bars and restaurants before they closed at midnight.
Condolences poured in from around the world, with top officials from the European Union, France, Norway, Greece and the United States expressing their shock at the attacks.