Eight people died and seven others injured at the headquarters of a bank in Thailand after workers accidentally released Pyrogen aerosol, officials said on Monday.
The accident occurred at the headquarters of Siam Commercial Bank, one of the biggest banks of the country, in Bangkok, on Sunday.
During an upgrade in the building’s security system, workers mistakenly released Pyrogen aerosol, a chemical fire retardant which is normally intended to deprive fire of oxygen.
According to Bangkok's Erawan medical emergency centre, eight people died and seven others suffered suffocation-related injuries, four of them were in serious condition.
Those who died were identified to be a security guard and seven contractors. Police are continuing to investigate the accident.
The apparent cause of death was suffocation from insufficient oxygen, however the official cause will not be known until autopsies are performed, said Erawan.
The bank said in a statement that an initial investigation found that the accident was caused by "negligence on the part of our contractors hired to improve fire protection in the building," adding that it would release more information following a board meeting on Monday.