Prince George's County Fire and EMS Department Chief Spokesperson Mark Brady said the last riders were brought down shortly after 9 p.m. "Everybody is doing (well) on board stalled auto", fire officials said.
According to Officials, about 20 people have been trapped on a roller coaster for several hours at a Six Flags just outside of Baltimore. "The safety of our guests is our highest priority and the ride will be closed for a thorough inspection before re-opening".
After stalling, the Joker's Jinx ride left the people stranded at100ft in the air until emergency services had to get passengers down one-by-one. That rescue also took around the same amount of time, Brady said.
This is not the first time people have been stuck on the Joker's Jinx.
So far, no information has been released about what caused the roller coaster to stop. It debuted at the amusement park in 1999. Joke's on. Six Flags if they ever think anyone's riding this roller coaster again.
A video uploaded to social media showed firefighters lowering passengers to the ground.
15-year-old Julia and 13-year-old Dezi were on the ride when it stalled and said, initially, they were not concerned because it started off normally.
The Berwyn Heights volunteer fire department said in a tweet that the cars of Joker's Jinx were 100 feet (30 meters) off the ground.