PORTLAND, Oregon: Twenty-eight people who were dangling upside down at a height for about 30 minutes on a ride at a century-old amusement park this week were rescued by emergency crews in Oregon.

Portland Fire and Rescue said all the riders were being evacuated and medically evaluated, and there were no reports of injuries. A message on social media platform X from the firefighters said they worked with engineers at Oaks Park to lower the ride manually, but crews had been preparing to conduct a high-angle ropes rescue if necessary.

Oaks Amusement Park said in a statement posted on social media that only one rider had a pre-existing medical condition. He was taken to a hospital for further evaluation. The rest were released after evaluation.

The ride, called AtmosFEAR, operates like a pendulum, and swings riders completely upside down.

Chris Ryan and his wife, from nearby Gresham, were at the park to celebrate his birthday. He told The Associated Press in a Facebook message that they were planning to ride AtmosFEAR when they saw it was stuck and heard people saying, "Oh my God, they are upside down."

They walked away because of "how scary the situation was," he said. When they eventually got on the Ferris wheel, they heard an announcement that the park was closed and people should evacuate.

Park staff immediately called 911 when the ride stopped, and emergency responders arrived about 25 minutes later. Park maintenance workers could return the ride to its unloading position minutes after first responders arrived.

Portland Fire said about 30 people were on board. The amusement park statement, however, said there were 28.

The park said there have been no incidents on the ride since it began operating in 2021. It will remain closed until further notice.

"We wish to express our deepest appreciation to the first responders and our staff for taking prompt action, leading to a positive outcome today, and to the rest of the park guests who swiftly followed directions to vacate the park to make way for the emergency responders to attend to the situation," a message by the park said.

Oaks Park first opened in 1905.