Smoke that triggered fire alarm on Stockholm’s Hornsgatan was theatrical smoke

"We received an alarm at 15.31 about smoke in a corridor. When we arrived, we found the same thing. We looked around and found that workmen had tested the ventilation using so-called theatrical smoke," says Mathias Häglund, a press spokesperson for the Rescue Service.

In connection with the alarm, Hornsgatan was blocked off in both directions. The roadblocks have now been removed.