One person was killed and several were injured in a roller coaster accident at the Grona Lund amusement park in the Swedish capital on Sunday, the TT news agency reported, citing a park spokesperson.
Public broadcaster SVT, citing eyewitnesses, said the park's Jetline roller coaster had partly derailed during a ride.
Police said they were still investigating.
"We are emptying the park and we've started our investigation," a police spokesperson said.
The Grona Lund park was not immediately available for comment.
The steel-tracked Jetline roller coaster reaches a speed of up to 90 kmph and a height of 30 metres, transporting more than one million visitors each year, the amusement park says on its website.


Trump bans three media outlets from White House
Three students killed in Philippine school shooting, including gunman, officials say
At least 16 killed in attack on police facility in northwest Pakistan
Trump nominee Lindberg to head World Food Programme
India finds Nestle baby food sample substandard, takes legal action