In the third mass food poisoning incident to hit China in a week, more than 60 migrant workers in Shanghai were hospitalized after eating at a construction site cafeteria on Monday, local food safety authorities reported on Tuesday.

The workers fell ill after eating supper and were taken to hospital on Tuesday morning after being diagnosed with food poisoning. All are reported to be in a stable condition.

The cause of the food poisoning is still unknown and an investigation is in progress.

The incident follows hot on the heels of two other mass poisonings in the country this month.

On Monday, 19 middle-school students were hospitalized with suspected food poisoning after eating lunch in a school cafeteria in Changchun, capital of northeast China's Jilin Province.

On April 9, more than 200 people fell ill and one person died in Harbin in northeastern China after they ate a hospital breakfast suspected of being contaminated with rat poison.

(Xinhua News Agency April 17, 2007)