Humen is at the mouth of the Pearl River.

The special task force was set up and started to look into the case after Xie's bureau reported the workers committed suicide.

Local police have also launched an investigation, local media said.

An executive from the Hong Kong-funded stationery company, located in Humen's Nanshan administrative district, did not comment on the case.

Relatives said the two victims committed suicide due to their heavy workload and poor treatment by their supervisors, but executives from the factory said the suicides may have been due to personal problems, according to the Dongguan Times. Fan was a skilled worker who had worked in the factory for eight years while Li was a temporary worker, the Dongguan Times said.

Media said more than 400 workers had quit after Fan and Li committed suicide, and the company is now having difficulties recruiting new employees.

Li Juan, an associate research fellow at the law research institute under the Guangdong Academy of Social Sciences, said migrant workers usually faced a heavy workload.

"Migrant workers should learn to use the law to protect their legal interests, instead of going to extremes, when they are not fairly treated by their employers," Li told China Daily on Monday.

"Employers should let their employees have a sense of belonging to avoid such tragedies," she added.

Zhang Yiren contributed to this story.