good morning. >> scary stuff here. a roller coaster that was speeding 55 miles an hour around a corner smash noose a -- smash noose a tree after it was derailed. they were on the ninja coaster at six flags near los angeles. they were left dangling 30 feet in the air and they were there for nearly three hours as day turned into night. >> it hits the tree. fire department had to chain it for extra precaution. >> firefighters bringing the trapped riders down one by one from the cars. four people who were sitting in the front of the ride, they suffered injuries to their knees and their neck. >> i was really shocked at first. i had no idea that that could even happen. it's just a really big shocker. >> who knew that could happen? park officials say the ninja roller coaster will remain