Rescuers have unloaded twelve people who were stuck on a Superman roller coaster at Six Flags Discovery Kingdom in Vallejo, Calif. after the ride stalled, a park spokesperson reports.

Witnesses said the ride stopped at the highest point around 2:30 p.m.

According to KTVU.com, the Superman ride was checked Sunday morning and no problems were found.

"The ride will be closed for a thorough safety inspection and will reopen when the inspection is complete," Nancy Chan, the Six Flags Discovery Kingdom spokesperson, said in a press release.

The Superman ride opened June 30 and is 15 stories tall at its highest point and reaches speeds of 62 mph.

Click for more from KTVU.com.