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Two bulls were instantly killed as they clashed heads in a Spanish bullfighting arena . Shocking footage captured the freak accident which saw the two half-ton creatures collide at high speed in front of crowds in a fighting ring. Filmed at Sanguesa in Navarra, the clip shows the brown and black bulls colliding head-on after being cheered on by rowdy spectators. The incident happened as they were let loose in the ring after arriving from a farm near the city of Avila further south