Contract manufacturer Foxconn International Holdings said on Monday that it has suspended operations at a production facility in India after workers experienced giddiness and nausea.
The company said it had halted operations at the plant to allow it to be checked and cleared by the relevant local authorities.
About 250 workers from the factory at Kancheepuram district in Tamil Nadu state of south India were treated at a nearby hospital on Friday. Apart from 28 workers still under observation at the hospital, the rest were discharged after treatment.
The facility mainly makes mechanical parts for mobile phones.
Foxconn said it believes that the incident may have been caused by the routine spraying of pesticide at the production facility, but all possible causes are being investigated by the relevant local authorities in India. The management of the facility is cooperating fully with the local authorities in connection with the investigation, it added.
Officials of the local state government were not immediately available for comment on the investigation.
The company expects production at the plant to resume in about a week.
Foxconn International Holdings is a subsidiary of Hon Hai Precision Industry, which assembles products for a number of companies including Apple and Dell. Hon Hai, which is better known by its Foxconn trade name, was recently blamed for suicides by some of the workers at a Chinese factory.