Roller Coaster Collision at London Amusement Park Leaves 4 Injured

Officials investigate why the computer controls of "The Smiler" attraction did not prevent the accident.
1:50 | 06/03/15

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Transcript for Roller Coaster Collision at London Amusement Park Leaves 4 Injured
Now, turning to a trip to the amusement park that turned quite reterrifying. The best-known roller coaster in the world. ABC's M a, Ra schiavocampo has the story. Reporter: This morning, four people recovering from serious injuries after an amusement park ride that was anything but fun. A car filled of thrill seekers, on the smiler, slammed into an empty track stuck on the tracks Tuesday. Look closely. You can see that the force of the collision wedged the cars together. All of a sudden, you heard a big bang and everybody started screaming. Reporter: The accident at a theme park outside of London, leaving 16 riders dangling three stories above the ground for 4 1/2 hours before rescuers were able to evacuate them. People tweeting. There's a very sophisticated computer system that watches the location of all the trains. Reporter: Statistically rides are safe. Still accidents do happen. In 2013, a Texas mom fell to her death, 14 stories from a roller coaster, her son sitting nearby. And last summer, 22 people were left hanging for three hours after a tree branch fell on this California ride. The smiler is manufactured by a Germany company. In this latest case, park officials say the park remains closed until we understand better the cause of this dreadful incident. Thanks to Mara for that. Let's go to ginger right now. Not June in the southeast.

This transcript has been automatically generated and may not be 100% accurate.

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