Four people died and 29 others, including 17 children, were injured following an explosion at a factory where gunpowder is handled in Colombia’s capital Bogota on Friday, authorities said.

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.