Two children were left dangling 90 metres in the air when a cable broke on a slingshot-style ride at a popular Spanish fair.
Social media footage of Friday's emergency at the Seville fair shows the Steel Max ride beginning normally as the riders are catapulted through the air at about 160km/h.
But seconds later, a cable appears to snap from the top of the pole, causing the seat capsule to slam into the opposite pole.
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Onlookers can be heard screaming as the accident unfolds.
The Seville Emergency Service Department said in a Facebook post that four people suffered mild injuries and were treated at the scene.
Spanish media outlet ABS Sevilla reports the two people stranded in the air were children.
After their rescue by civil protection workers, they were later transferred to a health centre, authorities said.
Spanish national police have taken over the investigation into the accident.
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