At least eight workers were killed and over a dozen others injured after a fire erupted in a chemical factory in northern India, police said Saturday. The fire broke out after a boiler exploded in the factory in the Hapur area of Uttar Pradesh state, said senior police officer Pravin Kumar. The injured have been hospitalized and three of them were in critical condition, he said. The intensity of the blast blew off the factory’s roof, said Ajay Mishra, a rescue worker. Authorities ordered an investigation. — Agencies