One worker died and more than 150 needed hospital treatment for toxic poisoning following an incident at a Vietnamese shoe factory on Friday.

Media reports say the dead worker was a woman who had recently suffered from hepatitis, while the other workers at Nam Kang Shoe Factory had non-life threatening symptoms including nausea and sore eyes.

The incident is now being investigated but is believed to have been triggered by the chemical formaldehyde which had been sprayed on leather stocks earlier that day.