India, June 30 -- At least five workers were killed and another 15 suffered severe injuries in an explosion at a chemical factory in the Pashamylaram Industrial Estate of Telangana's Sangareddy district on Monday morning, police said.

A police officer said the exact cause of the explosion was not immediately known. "The explosion blew up the industrial shed completely...the force of the blast was so intense that some of the workers were thrown up in the air and fell about 100 metres away," he said, quoting the workers.

A building collapsed while an adjacent structure was partially damaged. "Almost all the workers rushed out of the unit, but some workers are still feared to be trapped inside the facility," he said.

As many as 11 fire te...