Some 500 workers of a garment factory fell ill after drinking water at their workplace at Konabari Jarun in the city on Wednesday. The workers of ‘Keya Knit Composite Factory’ drank water after they joined work at 8:00 am, said factory sources. First, a female worker complained of dizziness and stomachache, and started vomiting after drinking the water. Later, other workers, mostly female ones, also complained of the same problems one after another. By the noon, around 500 workers of the factory fell ill.