"There are four people without vital signs," a fire brigade source told AFP.
The explosion happened at midday in a factory that produces wicks for a local Andean game called tejo or turmeque, in which metal discs are thrown at targets that contain gunpowder and explode on impact.
"The causes of the accident are being investigated," the fire service source said.
COMMENTS
Comments are moderated and generally will be posted if they are on-topic and not abusive.
For more information, please see our Comments FAQ