Danish police cordoned off Universitetsparken in Århus during the morning after several people reported symptoms after being in two buildings within Århus University.
Several people have experienced discomfort in the form of burning eyes and skin rash, but no one has been seriously injured, writes the Danish police on X.
Experts from the Danish Emergency Management Agency will investigate a possible chemical reaction.
Most of the park could later be reopened, but the two buildings remain cordoned off.
