Police said the children, hailing from Bihar's Gaya and Nawada districts, were rescued yesterday with the help of an NGO, Paryas.
"We found seven children working under pathetic working conditions and they were forced to work upto 15 hours a day under hazardous working environments... All these children were provided medical aid at a hospital here," police said, adding that all the rescued children have been sent to the NGO.
Police added that the factory owner is absconding and a case has been registered in this regard.
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