Construction on half of the dozen stadiums being erected for Brazil World Cup 2014 is behind schedule – and those working on the projects say the pressure to work quickly is affecting their safety.

The death of a 22-year-old worker who fell more than 100 feet on Saturday at Arena Amazonia resulted in a strike by the builder’s union and a court order halting all high work on the project, according to the BBC News.

More fatalities

Hours after the fall fatality, another worker died of a heart attack. His family claimed he was overworked. A fall claimed the life of another worker at the Arena Amazonia in March.

"Unnaceptably dangerous"

Prosecutors said working conditions were “unacceptably dangerous” and demanded a detailed report on the site’s safety conditions from the contracting firm, Andrade Gutierrez.

A report about safety is also expected from the team of experts who conducted an inspection of the building site on Monday.

The stadium is being built in the Brazilian city of Manaus, where the 2014 World Cup will be played.