WATCH: Human tower in Spain comes tumbling down in horror accident

SPECTATORS watched in horror during Barcelona’s annual La Mercè festival when a human tower or ‘castle’ collapsed.
Performers attempted to create an enormous tower of bodies, a tradition of the festival, but as the final two climbers scaled the ‘human castle’ those at the foundation of the structure lost their balance.
The tower collapsed causing participants at the top of the structure to fall from a great height, landing on those below them.
Many spectators captured the horror moment on their phones.
The tower collapse left a pile of bodies on the floor with one man clutching his chest in agony.
One person was stretchered away when emergency services arrived at the scene.
The La Mercè festival lasts five days and is held to honour the patron saint of Barcelona Mare de Deu de la Mercè.