In an update, the police department said "a recent threat assessment" by the intelligence service indicated the warning was "particularly related to the anniversary of the civil war in Syria -- it primarily concerns Syrian facilities."
AUSTRALIA TODDLER CHASING DEADLY SNAKE LEADS TO NEST DISCOVERY WITH 110 EGGS
A police van drives past horses at a cathedral in Vienna, Austria, on Mar 15, 2023. Austrian police are warning of a possible "Islamist-motivated attack" targeting churches in Vienna. (AP Photo/Heinz-Peter Bader)
"The potential threat is still on an increased level," the department tweeted Thursday. "The preventive security measures ordered remain in place. We are in contact with representatives of the corresponding facilities."
Despite Wednesday's initial warning, churches and houses of worship in Vienna remained open to visitors and worshipers. Police patrols were increased across the city, but no unusual incidents were reported.
Police said Thursday that "as soon as the respective assessments indicate an easing of the situation, we will be able to reduce our safeguarding measures."