Brazil was rocked by a fourth fatal World Cup stadium accident as a young construction worker fell to his death, heightening safety worries barely six months from kick off.
FIFA, which have played down concerns over stadium delays, expressed its sadness at the latest construction death.
"We would like to send our most sincere condolences to his family, relatives, colleagues and friends," football's governing body said in a statement.
The latest fatality, at the Manaus Arena in northern Brazil, will add scrutiny to the host nation's preparations, with some stadiums behind schedule and extra shifts being worked in a push to be ready for the football extravaganza.
Marcleudo de Melo Ferreira, 22, plunged 35 metres in the early hours while working on the roof of the $US200 million ($A225.00 million), 42,000-capacity arena.
He was taken to hospital but died before dawn.
Brazilian media reported that he fell after a cable broke as he prepared to finish a night shift.
The venue is currently 93 per cent complete and has around 1,900 people working around the clock to finish its construction.
The accident brought to four the number of deaths at venues being built for the event, and comes two weeks after two people died at the Sao Paulo stadium which is scheduled to host the June 12 opening match between Brazil and Croatia.
Saturday's death was also the second fatality at the Manaus Arena, which will host England's opening match on June 15 against Italy, plus three other World Cup matches.
After the first death in the tropical city's stadium, which lies far north of Sao Paulo and the capital Brasilia, the state public prosecutor demanded dozens of upgraded security measures be implemented.
The prosecutor's office was not immediately available for comment on the degree to which those needs had been met.
A January report had dubbed working conditions as unsatisfactory amid claims workers had not been issued with sufficient safety equipment.
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