A technician was killed on Sunday in Rio de Janeiro setting up a stage where pop superstar Shakira is set to perform a free concert this week, authorities and organizers said. 

Crews have been working for weeks to assemble a stage on the sands of the Brazilian city's Copacabana beach, where crowds are expected from around the world to see the Colombian singer perform on May 2 as part of her record-breaking world tour.

The man suffered crushing injuries to his legs in a lifting system, the fire department said in a statement.

Workers managed to free the man and he was taken to hospital, but he did not survive, the state fire department (CBMERJ) said.

"Unfortunately, the technician passed away in hospital," concert organizer Bonus Track said in a statement.

"Out of nowhere, we saw people running, and when we looked, the structure was on the ground," Antonio Marcos Ferreira dos Santos, 51, who was on the beach at the time, told AFP.

"People were saying that a man had gotten trapped underneath. People rushed over to pull him out."

© Agence France-Presse