Police escort grocon staff into work site after security incident at the Grocon factory in São Paulo, Brazil September 29, 2015

Police escort grocon sta속초출장마사지ff into work site after securit제천출장마사지y incident at the Grocon factory in São Paulo, Brazil September 29, 2015. REUTERS/Sergio Mo에그 벳raes

The workers who died were part of a group who were working to cut carbon dioxide emissions for a major state oil and gas company, said Brazilian police.

“The cause of death is undetermined,” Brazil’s Federal Institute of Public Health said on its website.

The incident occurred on September 28.

It was not immediately known whether the worker was an employee or a contractor, according to government sources familiar with the situation.

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The Grocon factory is one of 10 factories to be investigated after revelations by investigative newspaper Folha de São Paulo in November about how they had operated on the planet’s largest iron ore deposit.