<https://tienphongnews.com/4-workers-die-of-suffocation-in-factory-boiler-accident-in-northern-vietnam-287430.html#primaryimage>
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"4 workers die of suffocation in factory boiler accident in northern Vietnam"
<https://tienphongnews.com/4-workers-die-of-suffocation-in-factory-boiler-accident-in-northern-vietnam-287430.html>