After a Six Flags rollercoaster derailed in Los Angeles, four were left injured and 21 others were left stuck in the air. The ride that goes up to 55 MPH at the Six Flags Magic Mountain in Santa Clarita apparently struck a tree. The Los Angeles Fire Department arrived at the scene immediately and had to use some pretty serious equipment to get those on the Ninja ride down. Luckily there were no causalities. Check out some footage from the scene in the gallery.