Around 100 workers fell ill on Saturday at a garment factory in Gazipur on the outskirts of the Bangladeshi capital Dhaka, a police official said.

Most of the workers including many women of Keya Knit Composite Factory were hospitalized when they started vomiting and reporting stomach pains shortly after joining works in the morning, said the police official who did not like to be named.

A spokesman of the factory was not available for comment.

According to the police official, the workers were out of danger and many have already left hospitals.

"We've collected water samples and sent them to a laboratory for testing," he said.

In the past, many such incidents happened due to water contamination, the official said.

In June 2013, nearly 500 workers of a garment factory in Ashulia on the outskirts of Dhaka were hospitalized after drinking contaminated water.