Eight
people have died at the headquarters of one of Thailand's largest banks when
workers accidentally triggered the release of fire extinguishing chemicals
during an upgrade of the building's safety system, officials said on Monday.
Seven
other people were injured in the accident, which occurred on Sunday night in
the basement of the Siam Commercial Bank's headquarters in Bangkok.
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."
Workers
were upgrading a fire extinguishing system in a document archive room in the
bank's basement when the accident occurred, causing the release of Pyrogen
aerosol, officials said.
Police
were investigating the accident and the bank said it would release more
information after a meeting of its board members on Monday.
Pyrogen
is a chemical fire retardant normally intended to deprive fire of oxygen and is
typically used in places where extinguishing a fire with water would damage
documents or equipment.
Pyrogen's
website says the dense aerosol is "most effective in unoccupied areas.
It
says people should avoid exposure to Pyrogen and any "accidental exposure
to the aerosol should be limited to five minutes."
The
bank identified those who died as a security guard and seven contractors.
Bangkok's
Erawan medical emergency centre said five people died at the site of the
accident and three died later at a hospital.
It
said the apparent cause of death was suffocation from insufficient oxygen, but
that the official cause would not be known until autopsies are performed.
Seven
other people suffered suffocation-related injuries, including four who were in
serious condition, Erawan said.
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