Two construction workers have died at the stadium in Brazil where England are due to play the opening match of their World Cup campaign against Italy.
Marcleudo de Melo Ferreira, 22, died in hospital on Saturday after falling 115 feet from the roof of the Arena Amazonia in Manaus when a cable broke.
A few hours later, a second worker died of a heart attack while paving an area outside the venue. Local media claimed the 49-year-old's family had complained that he had been working seven days a week.
The jungle city stadium is behind schedule, with work under way day and night to ensure its completion by the end of the year.
Saturday's developments will further raise concerns about worker safety as FIFA's deadline looms.
Two workers were killed a fortnight ago when a crane collapsed at a stadium in Sao Paulo - where England play their second game against Uruguay.
A message of condolence posted on FIFA president Sepp Blatter's Twitter page read: "Very sad to learn that a young construction worker died at Arena Amazonia in Manaus earlier today. My deepest sympathies go to his family."
Andrade Gutierrez, the construction company building the Arena Amazonia, said work would be halted until Sunday after Saturday's fatal fall.
But the second death, while it may not be connected with working conditions, prompted threats of a strike by the local builders' union from Monday.