The Department of Environment yesterday sealed three factories at the city's Hazaribagh and arrested its owners for using toxic tannery-waste in poultry and fish feeds.

A DoE team, in a surprise raid at MK Enterprise, Zeko Fine Leather and Amir Multi Food, found workers filling sacks with dried up tannery waste, said Monir Chowdhury, director (monitoring and enforcement) of the department.

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