Seventy workers at a textile mill in Luancheng County in north China's Hebei Province were found poisoned Monday after they had lunch in the plant's cafeteria.

They were sent to hospital right after symptoms showed up and received treatment in time.

The condition of all the seventy is stable and they are still in hospital by press time.

Organic phosphor was found in the workers' stomachs, so that purposed poisoning can not be excluded, local police said.

The police is probing into the cause of the accident.