Two workers were killed dismantling the stage after a Rolling Stones concert in Madrid, local police have confirmed.
Two other stage hands were injured in the accident at the Vicente Calderon stadium and are now in hospital.
A spokesman for the British rock group said they were "deeply saddened" to hear the news.
"Their heartfelt wishes for a speedy recovery go out to the injured and their profound sympathies to the families of the deceased," he said.
The fatal accident occurred on Friday during the dismantling of the Rolling Stones stage, following a concert given by the group on Thursday night.
According to police, three of the workers fell 10m (33ft) from a metal structure and landed on a fourth.
The dead workers were later named as Benno Goldewijk, 44, from Holland, and Spaniard Alfredo Pecina Matias, 38.
The Rolling Stones, currently on the European leg of their A Bigger Bang world tour, are due to play in El Eijido, Spain, this weekend.
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