People panicked and panicked in the crowd that erupted in the audience at rapper Travis Scott's gig in Houston on November 5.
The riot led to the deaths of eight people, including two children.
Petter Säterhed at the Swedish Civil Contingencies Agency believes that it can not be ruled out that something similar could happen at a concert in Sweden.
- It is not impossible that it could happen in Sweden.
Among Swedish organizers, the competence in terms of event security is very widespread, he says.
"An audience is stupid"
There are some who have worked with the issues for a long time and are well aware of the risks - and there are new organizers where the competence is a bit lacking, says Petter Säterhed.
- There is a saying that goes "a person is smart, an audience is stupid".
In an audience, you see most people's heads and have no idea what's going on a few meters further ahead, and you do not know how to get to safety, he says.
Hear Petter Säterhed talk about event security in the clip.